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Finding the Fourth Proportional to 1,227.56, 1,841.28 and 458

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Solution

The fourth proportional to 1,227.56, 1,841.28 and 458 is: 686.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,227.56 : 1,841.28 = 458 : x
  2. Step 2: Convert to fraction form
    1,227.56/1,841.28 = 458/x
  3. Step 3: Cross multiply
    1,227.56x = 1,841.28 × 458
  4. Step 4: Simplify right side
    1,227.56x = 843,306.24
  5. Step 5: Solve for x
    x = 843,306.24/1,227.56
  6. Step 6: Final answer
    x = 686.98

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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.