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Finding the Fourth Proportional to 171.81, 257.54 and 98.59

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Solution

The fourth proportional to 171.81, 257.54 and 98.59 is: 147.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.81 : 257.54 = 98.59 : x
  2. Step 2: Convert to fraction form
    171.81/257.54 = 98.59/x
  3. Step 3: Cross multiply
    171.81x = 257.54 × 98.59
  4. Step 4: Simplify right side
    171.81x = 25,390.87
  5. Step 5: Solve for x
    x = 25,390.87/171.81
  6. Step 6: Final answer
    x = 147.78

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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.