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Finding the Fourth Proportional to 257.79, 387.51 and 239.97

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Solution

The fourth proportional to 257.79, 387.51 and 239.97 is: 360.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.79 : 387.51 = 239.97 : x
  2. Step 2: Convert to fraction form
    257.79/387.51 = 239.97/x
  3. Step 3: Cross multiply
    257.79x = 387.51 × 239.97
  4. Step 4: Simplify right side
    257.79x = 92,990.77
  5. Step 5: Solve for x
    x = 92,990.77/257.79
  6. Step 6: Final answer
    x = 360.72

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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.