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Finding the Fourth Proportional to 728.32, 1,091.91 and 338.56

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Solution

The fourth proportional to 728.32, 1,091.91 and 338.56 is: 507.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.32 : 1,091.91 = 338.56 : x
  2. Step 2: Convert to fraction form
    728.32/1,091.91 = 338.56/x
  3. Step 3: Cross multiply
    728.32x = 1,091.91 × 338.56
  4. Step 4: Simplify right side
    728.32x = 369,677.05
  5. Step 5: Solve for x
    x = 369,677.05/728.32
  6. Step 6: Final answer
    x = 507.58

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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.