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Finding the Fourth Proportional to 753.92, 1,129.76 and 617.92

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Solution

The fourth proportional to 753.92, 1,129.76 and 617.92 is: 925.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.92 : 1,129.76 = 617.92 : x
  2. Step 2: Convert to fraction form
    753.92/1,129.76 = 617.92/x
  3. Step 3: Cross multiply
    753.92x = 1,129.76 × 617.92
  4. Step 4: Simplify right side
    753.92x = 698,101.30
  5. Step 5: Solve for x
    x = 698,101.30/753.92
  6. Step 6: Final answer
    x = 925.96

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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.