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Finding the Fourth Proportional to 114.10, 171.15 and 79.90

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Solution

The fourth proportional to 114.10, 171.15 and 79.90 is: 119.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.10 : 171.15 = 79.90 : x
  2. Step 2: Convert to fraction form
    114.10/171.15 = 79.90/x
  3. Step 3: Cross multiply
    114.10x = 171.15 × 79.90
  4. Step 4: Simplify right side
    114.10x = 13,674.89
  5. Step 5: Solve for x
    x = 13,674.89/114.10
  6. Step 6: Final answer
    x = 119.85

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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.