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Finding the Fourth Proportional to 961.92, 1,443.96 and 572.76

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Solution

The fourth proportional to 961.92, 1,443.96 and 572.76 is: 859.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.92 : 1,443.96 = 572.76 : x
  2. Step 2: Convert to fraction form
    961.92/1,443.96 = 572.76/x
  3. Step 3: Cross multiply
    961.92x = 1,443.96 × 572.76
  4. Step 4: Simplify right side
    961.92x = 827,042.53
  5. Step 5: Solve for x
    x = 827,042.53/961.92
  6. Step 6: Final answer
    x = 859.78

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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.