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Finding the Fourth Proportional to 724.77, 1,000.19 and 393.20

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Solution

The fourth proportional to 724.77, 1,000.19 and 393.20 is: 542.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.77 : 1,000.19 = 393.20 : x
  2. Step 2: Convert to fraction form
    724.77/1,000.19 = 393.20/x
  3. Step 3: Cross multiply
    724.77x = 1,000.19 × 393.20
  4. Step 4: Simplify right side
    724.77x = 393,274.71
  5. Step 5: Solve for x
    x = 393,274.71/724.77
  6. Step 6: Final answer
    x = 542.62

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Half scale
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Double scale
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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.