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Finding the Fourth Proportional to 661,644.80, 992,467.20 and 409,126.40

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Solution

The fourth proportional to 661,644.80, 992,467.20 and 409,126.40 is: 613,689.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,644.80 : 992,467.20 = 409,126.40 : x
  2. Step 2: Convert to fraction form
    661,644.80/992,467.20 = 409,126.40/x
  3. Step 3: Cross multiply
    661,644.80x = 992,467.20 × 409,126.40
  4. Step 4: Simplify right side
    661,644.80x = 406,044,532,654.08
  5. Step 5: Solve for x
    x = 406,044,532,654.08/661,644.80
  6. Step 6: Final answer
    x = 613,689.60

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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.