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Finding the Fourth Proportional to 661,808.60, 991,541.70 and 639,882.20

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Solution

The fourth proportional to 661,808.60, 991,541.70 and 639,882.20 is: 958,690.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,808.60 : 991,541.70 = 639,882.20 : x
  2. Step 2: Convert to fraction form
    661,808.60/991,541.70 = 639,882.20/x
  3. Step 3: Cross multiply
    661,808.60x = 991,541.70 × 639,882.20
  4. Step 4: Simplify right side
    661,808.60x = 634,469,884,387.74
  5. Step 5: Solve for x
    x = 634,469,884,387.74/661,808.60
  6. Step 6: Final answer
    x = 958,690.90

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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.