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Finding the Fourth Proportional to 724.66, 1,087.18 and 313.70

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Solution

The fourth proportional to 724.66, 1,087.18 and 313.70 is: 470.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.66 : 1,087.18 = 313.70 : x
  2. Step 2: Convert to fraction form
    724.66/1,087.18 = 313.70/x
  3. Step 3: Cross multiply
    724.66x = 1,087.18 × 313.70
  4. Step 4: Simplify right side
    724.66x = 341,046.22
  5. Step 5: Solve for x
    x = 341,046.22/724.66
  6. Step 6: Final answer
    x = 470.63

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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.