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Finding the Fourth Proportional to 749.92, 1,125.20 and 339.04

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Solution

The fourth proportional to 749.92, 1,125.20 and 339.04 is: 508.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.92 : 1,125.20 = 339.04 : x
  2. Step 2: Convert to fraction form
    749.92/1,125.20 = 339.04/x
  3. Step 3: Cross multiply
    749.92x = 1,125.20 × 339.04
  4. Step 4: Simplify right side
    749.92x = 381,487.81
  5. Step 5: Solve for x
    x = 381,487.81/749.92
  6. Step 6: Final answer
    x = 508.70

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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.