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Finding the Fourth Proportional to 643,346.40, 965,019.60 and 444,280.80

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Solution

The fourth proportional to 643,346.40, 965,019.60 and 444,280.80 is: 666,421.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,346.40 : 965,019.60 = 444,280.80 : x
  2. Step 2: Convert to fraction form
    643,346.40/965,019.60 = 444,280.80/x
  3. Step 3: Cross multiply
    643,346.40x = 965,019.60 × 444,280.80
  4. Step 4: Simplify right side
    643,346.40x = 428,739,679,903.68
  5. Step 5: Solve for x
    x = 428,739,679,903.68/643,346.40
  6. Step 6: Final answer
    x = 666,421.20

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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.