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Finding the Fourth Proportional to 171.17, 256.35 and 89.77

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Solution

The fourth proportional to 171.17, 256.35 and 89.77 is: 134.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.17 : 256.35 = 89.77 : x
  2. Step 2: Convert to fraction form
    171.17/256.35 = 89.77/x
  3. Step 3: Cross multiply
    171.17x = 256.35 × 89.77
  4. Step 4: Simplify right side
    171.17x = 23,012.54
  5. Step 5: Solve for x
    x = 23,012.54/171.17
  6. Step 6: Final answer
    x = 134.44

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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.