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Finding the Fourth Proportional to 742.27, 1,024.77 and 660.28

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Solution

The fourth proportional to 742.27, 1,024.77 and 660.28 is: 911.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.27 : 1,024.77 = 660.28 : x
  2. Step 2: Convert to fraction form
    742.27/1,024.77 = 660.28/x
  3. Step 3: Cross multiply
    742.27x = 1,024.77 × 660.28
  4. Step 4: Simplify right side
    742.27x = 676,635.14
  5. Step 5: Solve for x
    x = 676,635.14/742.27
  6. Step 6: Final answer
    x = 911.58

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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.