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Finding the Fourth Proportional to 724.64, 1,087.38 and 291.75

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Solution

The fourth proportional to 724.64, 1,087.38 and 291.75 is: 437.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.64 : 1,087.38 = 291.75 : x
  2. Step 2: Convert to fraction form
    724.64/1,087.38 = 291.75/x
  3. Step 3: Cross multiply
    724.64x = 1,087.38 × 291.75
  4. Step 4: Simplify right side
    724.64x = 317,243.12
  5. Step 5: Solve for x
    x = 317,243.12/724.64
  6. Step 6: Final answer
    x = 437.80

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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.