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Finding the Fourth Proportional to 258.48, 387.99 and 136.77

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Solution

The fourth proportional to 258.48, 387.99 and 136.77 is: 205.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.48 : 387.99 = 136.77 : x
  2. Step 2: Convert to fraction form
    258.48/387.99 = 136.77/x
  3. Step 3: Cross multiply
    258.48x = 387.99 × 136.77
  4. Step 4: Simplify right side
    258.48x = 53,065.39
  5. Step 5: Solve for x
    x = 53,065.39/258.48
  6. Step 6: Final answer
    x = 205.30

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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.