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Finding the Fourth Proportional to 724.48, 1,086.67 and 291.33

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Solution

The fourth proportional to 724.48, 1,086.67 and 291.33 is: 436.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.48 : 1,086.67 = 291.33 : x
  2. Step 2: Convert to fraction form
    724.48/1,086.67 = 291.33/x
  3. Step 3: Cross multiply
    724.48x = 1,086.67 × 291.33
  4. Step 4: Simplify right side
    724.48x = 316,579.57
  5. Step 5: Solve for x
    x = 316,579.57/724.48
  6. Step 6: Final answer
    x = 436.97

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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.