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Finding the Fourth Proportional to 642,406.40, 963,609.60 and 404,979.20

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Solution

The fourth proportional to 642,406.40, 963,609.60 and 404,979.20 is: 607,468.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,406.40 : 963,609.60 = 404,979.20 : x
  2. Step 2: Convert to fraction form
    642,406.40/963,609.60 = 404,979.20/x
  3. Step 3: Cross multiply
    642,406.40x = 963,609.60 × 404,979.20
  4. Step 4: Simplify right side
    642,406.40x = 390,241,844,920.32
  5. Step 5: Solve for x
    x = 390,241,844,920.32/642,406.40
  6. Step 6: Final answer
    x = 607,468.80

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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.