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Finding the Fourth Proportional to 170.78, 256.17 and 74.60

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Solution

The fourth proportional to 170.78, 256.17 and 74.60 is: 111.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.78 : 256.17 = 74.60 : x
  2. Step 2: Convert to fraction form
    170.78/256.17 = 74.60/x
  3. Step 3: Cross multiply
    170.78x = 256.17 × 74.60
  4. Step 4: Simplify right side
    170.78x = 19,110.28
  5. Step 5: Solve for x
    x = 19,110.28/170.78
  6. Step 6: Final answer
    x = 111.90

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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.