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Finding the Fourth Proportional to 171, 256.32 and 89.76

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Solution

The fourth proportional to 171, 256.32 and 89.76 is: 134.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    171 : 256.32 = 89.76 : x
  2. Step 2: Convert to fraction form
    171/256.32 = 89.76/x
  3. Step 3: Cross multiply
    171x = 256.32 × 89.76
  4. Step 4: Simplify right side
    171x = 23,007.28
  5. Step 5: Solve for x
    x = 23,007.28/171
  6. Step 6: Final answer
    x = 134.55

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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.