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Finding the Fourth Proportional to 643,410.40, 965,115.60 and 243,918.40

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Solution

The fourth proportional to 643,410.40, 965,115.60 and 243,918.40 is: 365,877.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,410.40 : 965,115.60 = 243,918.40 : x
  2. Step 2: Convert to fraction form
    643,410.40/965,115.60 = 243,918.40/x
  3. Step 3: Cross multiply
    643,410.40x = 965,115.60 × 243,918.40
  4. Step 4: Simplify right side
    643,410.40x = 235,409,452,967.04
  5. Step 5: Solve for x
    x = 235,409,452,967.04/643,410.40
  6. Step 6: Final answer
    x = 365,877.60

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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.