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Finding the Fourth Proportional to 171.39, 257.13 and 99.19

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Solution

The fourth proportional to 171.39, 257.13 and 99.19 is: 148.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.39 : 257.13 = 99.19 : x
  2. Step 2: Convert to fraction form
    171.39/257.13 = 99.19/x
  3. Step 3: Cross multiply
    171.39x = 257.13 × 99.19
  4. Step 4: Simplify right side
    171.39x = 25,504.08
  5. Step 5: Solve for x
    x = 25,504.08/171.39
  6. Step 6: Final answer
    x = 148.81

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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.