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Finding the Fourth Proportional to 171.34, 256.91 and 55.76

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Solution

The fourth proportional to 171.34, 256.91 and 55.76 is: 83.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.34 : 256.91 = 55.76 : x
  2. Step 2: Convert to fraction form
    171.34/256.91 = 55.76/x
  3. Step 3: Cross multiply
    171.34x = 256.91 × 55.76
  4. Step 4: Simplify right side
    171.34x = 14,324.02
  5. Step 5: Solve for x
    x = 14,324.02/171.34
  6. Step 6: Final answer
    x = 83.60

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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.