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Finding the Fourth Proportional to 171.60, 256.51 and 127.86

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Solution

The fourth proportional to 171.60, 256.51 and 127.86 is: 191.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.60 : 256.51 = 127.86 : x
  2. Step 2: Convert to fraction form
    171.60/256.51 = 127.86/x
  3. Step 3: Cross multiply
    171.60x = 256.51 × 127.86
  4. Step 4: Simplify right side
    171.60x = 32,796.57
  5. Step 5: Solve for x
    x = 32,796.57/171.60
  6. Step 6: Final answer
    x = 191.13

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.