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Finding the Fourth Proportional to 171.55, 256.91 and 99.19

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Solution

The fourth proportional to 171.55, 256.91 and 99.19 is: 148.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.55 : 256.91 = 99.19 : x
  2. Step 2: Convert to fraction form
    171.55/256.91 = 99.19/x
  3. Step 3: Cross multiply
    171.55x = 256.91 × 99.19
  4. Step 4: Simplify right side
    171.55x = 25,481.12
  5. Step 5: Solve for x
    x = 25,481.12/171.55
  6. Step 6: Final answer
    x = 148.54

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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.