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Finding the Fourth Proportional to 171.31, 256.78 and 98.10

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Solution

The fourth proportional to 171.31, 256.78 and 98.10 is: 147.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.31 : 256.78 = 98.10 : x
  2. Step 2: Convert to fraction form
    171.31/256.78 = 98.10/x
  3. Step 3: Cross multiply
    171.31x = 256.78 × 98.10
  4. Step 4: Simplify right side
    171.31x = 25,190.12
  5. Step 5: Solve for x
    x = 25,190.12/171.31
  6. Step 6: Final answer
    x = 147.04

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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.