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Finding the Fourth Proportional to 258.04, 387.28 and 136.39

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Solution

The fourth proportional to 258.04, 387.28 and 136.39 is: 204.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.04 : 387.28 = 136.39 : x
  2. Step 2: Convert to fraction form
    258.04/387.28 = 136.39/x
  3. Step 3: Cross multiply
    258.04x = 387.28 × 136.39
  4. Step 4: Simplify right side
    258.04x = 52,819.18
  5. Step 5: Solve for x
    x = 52,819.18/258.04
  6. Step 6: Final answer
    x = 204.70

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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.