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Finding the Fourth Proportional to 724.60, 1,083.54 and 688.12

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Solution

The fourth proportional to 724.60, 1,083.54 and 688.12 is: 1,028.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.60 : 1,083.54 = 688.12 : x
  2. Step 2: Convert to fraction form
    724.60/1,083.54 = 688.12/x
  3. Step 3: Cross multiply
    724.60x = 1,083.54 × 688.12
  4. Step 4: Simplify right side
    724.60x = 745,605.54
  5. Step 5: Solve for x
    x = 745,605.54/724.60
  6. Step 6: Final answer
    x = 1,028.99

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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.