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Finding the Fourth Proportional to 642,780.60, 887,100.84 and 356,356.08

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Solution

The fourth proportional to 642,780.60, 887,100.84 and 356,356.08 is: 491,806.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,780.60 : 887,100.84 = 356,356.08 : x
  2. Step 2: Convert to fraction form
    642,780.60/887,100.84 = 356,356.08/x
  3. Step 3: Cross multiply
    642,780.60x = 887,100.84 × 356,356.08
  4. Step 4: Simplify right side
    642,780.60x = 316,123,777,907.11
  5. Step 5: Solve for x
    x = 316,123,777,907.11/642,780.60
  6. Step 6: Final answer
    x = 491,806.66

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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.