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Finding the Fourth Proportional to 749.29, 1,123.15 and 517.43

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Solution

The fourth proportional to 749.29, 1,123.15 and 517.43 is: 775.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.29 : 1,123.15 = 517.43 : x
  2. Step 2: Convert to fraction form
    749.29/1,123.15 = 517.43/x
  3. Step 3: Cross multiply
    749.29x = 1,123.15 × 517.43
  4. Step 4: Simplify right side
    749.29x = 581,148.92
  5. Step 5: Solve for x
    x = 581,148.92/749.29
  6. Step 6: Final answer
    x = 775.60

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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.