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Finding the Fourth Proportional to 724.88, 1,001.15 and 491.60

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Solution

The fourth proportional to 724.88, 1,001.15 and 491.60 is: 678.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.88 : 1,001.15 = 491.60 : x
  2. Step 2: Convert to fraction form
    724.88/1,001.15 = 491.60/x
  3. Step 3: Cross multiply
    724.88x = 1,001.15 × 491.60
  4. Step 4: Simplify right side
    724.88x = 492,161.56
  5. Step 5: Solve for x
    x = 492,161.56/724.88
  6. Step 6: Final answer
    x = 678.96

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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.