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Finding the Fourth Proportional to 642,891.46, 887,211.78 and 356,394.46

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Solution

The fourth proportional to 642,891.46, 887,211.78 and 356,394.46 is: 491,836.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,891.46 : 887,211.78 = 356,394.46 : x
  2. Step 2: Convert to fraction form
    642,891.46/887,211.78 = 356,394.46/x
  3. Step 3: Cross multiply
    642,891.46x = 887,211.78 × 356,394.46
  4. Step 4: Simplify right side
    642,891.46x = 316,197,363,238.74
  5. Step 5: Solve for x
    x = 316,197,363,238.74/642,891.46
  6. Step 6: Final answer
    x = 491,836.31

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1.5x scale

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.