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Finding the Fourth Proportional to 257.38, 386.69 and 239.16

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Solution

The fourth proportional to 257.38, 386.69 and 239.16 is: 359.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.38 : 386.69 = 239.16 : x
  2. Step 2: Convert to fraction form
    257.38/386.69 = 239.16/x
  3. Step 3: Cross multiply
    257.38x = 386.69 × 239.16
  4. Step 4: Simplify right side
    257.38x = 92,480.78
  5. Step 5: Solve for x
    x = 92,480.78/257.38
  6. Step 6: Final answer
    x = 359.32

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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.