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Finding the Fourth Proportional to 171.64, 256.92 and 128.06

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Solution

The fourth proportional to 171.64, 256.92 and 128.06 is: 191.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.64 : 256.92 = 128.06 : x
  2. Step 2: Convert to fraction form
    171.64/256.92 = 128.06/x
  3. Step 3: Cross multiply
    171.64x = 256.92 × 128.06
  4. Step 4: Simplify right side
    171.64x = 32,901.18
  5. Step 5: Solve for x
    x = 32,901.18/171.64
  6. Step 6: Final answer
    x = 191.69

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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.