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Finding the Fourth Proportional to 724.80, 999.28 and 491.52

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Solution

The fourth proportional to 724.80, 999.28 and 491.52 is: 677.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.80 : 999.28 = 491.52 : x
  2. Step 2: Convert to fraction form
    724.80/999.28 = 491.52/x
  3. Step 3: Cross multiply
    724.80x = 999.28 × 491.52
  4. Step 4: Simplify right side
    724.80x = 491,166.11
  5. Step 5: Solve for x
    x = 491,166.11/724.80
  6. Step 6: Final answer
    x = 677.66

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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.