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Finding the Fourth Proportional to 482.72, 725.76 and 387.20

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Solution

The fourth proportional to 482.72, 725.76 and 387.20 is: 582.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    482.72 : 725.76 = 387.20 : x
  2. Step 2: Convert to fraction form
    482.72/725.76 = 387.20/x
  3. Step 3: Cross multiply
    482.72x = 725.76 × 387.20
  4. Step 4: Simplify right side
    482.72x = 281,014.27
  5. Step 5: Solve for x
    x = 281,014.27/482.72
  6. Step 6: Final answer
    x = 582.15

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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.