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Finding the Fourth Proportional to 724.74, 1,000.15 and 393.17

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Solution

The fourth proportional to 724.74, 1,000.15 and 393.17 is: 542.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.74 : 1,000.15 = 393.17 : x
  2. Step 2: Convert to fraction form
    724.74/1,000.15 = 393.17/x
  3. Step 3: Cross multiply
    724.74x = 1,000.15 × 393.17
  4. Step 4: Simplify right side
    724.74x = 393,222.99
  5. Step 5: Solve for x
    x = 393,222.99/724.74
  6. Step 6: Final answer
    x = 542.57

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1.5x scale

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.