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Finding the Fourth Proportional to 257.76, 386.37 and 136.11

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Solution

The fourth proportional to 257.76, 386.37 and 136.11 is: 204.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.76 : 386.37 = 136.11 : x
  2. Step 2: Convert to fraction form
    257.76/386.37 = 136.11/x
  3. Step 3: Cross multiply
    257.76x = 386.37 × 136.11
  4. Step 4: Simplify right side
    257.76x = 52,587.01
  5. Step 5: Solve for x
    x = 52,587.01/257.76
  6. Step 6: Final answer
    x = 204.02

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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.