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Finding the Fourth Proportional to 171.95, 257.88 and 99.86

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Solution

The fourth proportional to 171.95, 257.88 and 99.86 is: 149.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.95 : 257.88 = 99.86 : x
  2. Step 2: Convert to fraction form
    171.95/257.88 = 99.86/x
  3. Step 3: Cross multiply
    171.95x = 257.88 × 99.86
  4. Step 4: Simplify right side
    171.95x = 25,751.90
  5. Step 5: Solve for x
    x = 25,751.90/171.95
  6. Step 6: Final answer
    x = 149.76

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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.