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Finding the Fourth Proportional to 484.42, 725.68 and 387.12

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Solution

The fourth proportional to 484.42, 725.68 and 387.12 is: 579.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    484.42 : 725.68 = 387.12 : x
  2. Step 2: Convert to fraction form
    484.42/725.68 = 387.12/x
  3. Step 3: Cross multiply
    484.42x = 725.68 × 387.12
  4. Step 4: Simplify right side
    484.42x = 280,923.31
  5. Step 5: Solve for x
    x = 280,923.31/484.42
  6. Step 6: Final answer
    x = 579.92

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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.