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Finding the Fourth Proportional to 170.96, 256.36 and 74.80

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Solution

The fourth proportional to 170.96, 256.36 and 74.80 is: 112.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.96 : 256.36 = 74.80 : x
  2. Step 2: Convert to fraction form
    170.96/256.36 = 74.80/x
  3. Step 3: Cross multiply
    170.96x = 256.36 × 74.80
  4. Step 4: Simplify right side
    170.96x = 19,175.73
  5. Step 5: Solve for x
    x = 19,175.73/170.96
  6. Step 6: Final answer
    x = 112.16

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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.