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Finding the Fourth Proportional to 258.15, 387.94 and 136.50

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Solution

The fourth proportional to 258.15, 387.94 and 136.50 is: 205.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.15 : 387.94 = 136.50 : x
  2. Step 2: Convert to fraction form
    258.15/387.94 = 136.50/x
  3. Step 3: Cross multiply
    258.15x = 387.94 × 136.50
  4. Step 4: Simplify right side
    258.15x = 52,954.45
  5. Step 5: Solve for x
    x = 52,954.45/258.15
  6. Step 6: Final answer
    x = 205.13

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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.