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Finding the Fourth Proportional to 724.32, 1,085.28 and 338.88

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Solution

The fourth proportional to 724.32, 1,085.28 and 338.88 is: 507.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.32 : 1,085.28 = 338.88 : x
  2. Step 2: Convert to fraction form
    724.32/1,085.28 = 338.88/x
  3. Step 3: Cross multiply
    724.32x = 1,085.28 × 338.88
  4. Step 4: Simplify right side
    724.32x = 367,779.69
  5. Step 5: Solve for x
    x = 367,779.69/724.32
  6. Step 6: Final answer
    x = 507.76

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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.