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Finding the Fourth Proportional to 387.31, 580.47 and 181.42

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Solution

The fourth proportional to 387.31, 580.47 and 181.42 is: 271.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.31 : 580.47 = 181.42 : x
  2. Step 2: Convert to fraction form
    387.31/580.47 = 181.42/x
  3. Step 3: Cross multiply
    387.31x = 580.47 × 181.42
  4. Step 4: Simplify right side
    387.31x = 105,308.78
  5. Step 5: Solve for x
    x = 105,308.78/387.31
  6. Step 6: Final answer
    x = 271.90

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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.