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Finding the Fourth Proportional to 170.74, 256.11 and 55.20

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Solution

The fourth proportional to 170.74, 256.11 and 55.20 is: 82.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.74 : 256.11 = 55.20 : x
  2. Step 2: Convert to fraction form
    170.74/256.11 = 55.20/x
  3. Step 3: Cross multiply
    170.74x = 256.11 × 55.20
  4. Step 4: Simplify right side
    170.74x = 14,136.90
  5. Step 5: Solve for x
    x = 14,136.90/170.74
  6. Step 6: Final answer
    x = 82.80

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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.