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Finding the Fourth Proportional to 724.15, 1,086.38 and 291.30

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Solution

The fourth proportional to 724.15, 1,086.38 and 291.30 is: 437.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.15 : 1,086.38 = 291.30 : x
  2. Step 2: Convert to fraction form
    724.15/1,086.38 = 291.30/x
  3. Step 3: Cross multiply
    724.15x = 1,086.38 × 291.30
  4. Step 4: Simplify right side
    724.15x = 316,467.22
  5. Step 5: Solve for x
    x = 316,467.22/724.15
  6. Step 6: Final answer
    x = 437.02

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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.