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Finding the Fourth Proportional to 258.17, 387.16 and 142.59

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Solution

The fourth proportional to 258.17, 387.16 and 142.59 is: 213.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.17 : 387.16 = 142.59 : x
  2. Step 2: Convert to fraction form
    258.17/387.16 = 142.59/x
  3. Step 3: Cross multiply
    258.17x = 387.16 × 142.59
  4. Step 4: Simplify right side
    258.17x = 55,204.79
  5. Step 5: Solve for x
    x = 55,204.79/258.17
  6. Step 6: Final answer
    x = 213.83

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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.