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Finding the Fourth Proportional to 728.70, 1,093.21 and 338.42

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Solution

The fourth proportional to 728.70, 1,093.21 and 338.42 is: 507.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.70 : 1,093.21 = 338.42 : x
  2. Step 2: Convert to fraction form
    728.70/1,093.21 = 338.42/x
  3. Step 3: Cross multiply
    728.70x = 1,093.21 × 338.42
  4. Step 4: Simplify right side
    728.70x = 369,957.82
  5. Step 5: Solve for x
    x = 369,957.82/728.70
  6. Step 6: Final answer
    x = 507.70

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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.