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Finding the Fourth Proportional to 747.92, 1,031.60 and 572.96

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Solution

The fourth proportional to 747.92, 1,031.60 and 572.96 is: 790.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.92 : 1,031.60 = 572.96 : x
  2. Step 2: Convert to fraction form
    747.92/1,031.60 = 572.96/x
  3. Step 3: Cross multiply
    747.92x = 1,031.60 × 572.96
  4. Step 4: Simplify right side
    747.92x = 591,065.54
  5. Step 5: Solve for x
    x = 591,065.54/747.92
  6. Step 6: Final answer
    x = 790.28

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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.