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Finding the Fourth Proportional to 643,403.40, 965,105.10 and 444,337.80

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Solution

The fourth proportional to 643,403.40, 965,105.10 and 444,337.80 is: 666,506.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,403.40 : 965,105.10 = 444,337.80 : x
  2. Step 2: Convert to fraction form
    643,403.40/965,105.10 = 444,337.80/x
  3. Step 3: Cross multiply
    643,403.40x = 965,105.10 × 444,337.80
  4. Step 4: Simplify right side
    643,403.40x = 428,832,676,902.78
  5. Step 5: Solve for x
    x = 428,832,676,902.78/643,403.40
  6. Step 6: Final answer
    x = 666,506.70

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.