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Finding the Fourth Proportional to 724.99, 1,086.65 and 313.71

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Solution

The fourth proportional to 724.99, 1,086.65 and 313.71 is: 470.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.99 : 1,086.65 = 313.71 : x
  2. Step 2: Convert to fraction form
    724.99/1,086.65 = 313.71/x
  3. Step 3: Cross multiply
    724.99x = 1,086.65 × 313.71
  4. Step 4: Simplify right side
    724.99x = 340,892.97
  5. Step 5: Solve for x
    x = 340,892.97/724.99
  6. Step 6: Final answer
    x = 470.20

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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.