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Finding the Fourth Proportional to 258.34, 387.37 and 136.70

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Solution

The fourth proportional to 258.34, 387.37 and 136.70 is: 204.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.34 : 387.37 = 136.70 : x
  2. Step 2: Convert to fraction form
    258.34/387.37 = 136.70/x
  3. Step 3: Cross multiply
    258.34x = 387.37 × 136.70
  4. Step 4: Simplify right side
    258.34x = 52,952.80
  5. Step 5: Solve for x
    x = 52,952.80/258.34
  6. Step 6: Final answer
    x = 204.98

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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.