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Finding the Fourth Proportional to 114.75, 171.54 and 85.85

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Solution

The fourth proportional to 114.75, 171.54 and 85.85 is: 128.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.75 : 171.54 = 85.85 : x
  2. Step 2: Convert to fraction form
    114.75/171.54 = 85.85/x
  3. Step 3: Cross multiply
    114.75x = 171.54 × 85.85
  4. Step 4: Simplify right side
    114.75x = 14,726.71
  5. Step 5: Solve for x
    x = 14,726.71/114.75
  6. Step 6: Final answer
    x = 128.34

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.