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Finding the Fourth Proportional to 643,215.53, 887,691.94 and 356,827.88

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Solution

The fourth proportional to 643,215.53, 887,691.94 and 356,827.88 is: 492,452.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,215.53 : 887,691.94 = 356,827.88 : x
  2. Step 2: Convert to fraction form
    643,215.53/887,691.94 = 356,827.88/x
  3. Step 3: Cross multiply
    643,215.53x = 887,691.94 × 356,827.88
  4. Step 4: Simplify right side
    643,215.53x = 316,753,227,712.76
  5. Step 5: Solve for x
    x = 316,753,227,712.76/643,215.53
  6. Step 6: Final answer
    x = 492,452.71

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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.