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Finding the Fourth Proportional to 642,785.92, 887,051.12 and 356,310.88

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Solution

The fourth proportional to 642,785.92, 887,051.12 and 356,310.88 is: 491,712.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,785.92 : 887,051.12 = 356,310.88 : x
  2. Step 2: Convert to fraction form
    642,785.92/887,051.12 = 356,310.88/x
  3. Step 3: Cross multiply
    642,785.92x = 887,051.12 × 356,310.88
  4. Step 4: Simplify right side
    642,785.92x = 316,065,965,172.19
  5. Step 5: Solve for x
    x = 316,065,965,172.19/642,785.92
  6. Step 6: Final answer
    x = 491,712.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.