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Finding the Fourth Proportional to 114.05, 170.72 and 81.45

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Solution

The fourth proportional to 114.05, 170.72 and 81.45 is: 121.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.05 : 170.72 = 81.45 : x
  2. Step 2: Convert to fraction form
    114.05/170.72 = 81.45/x
  3. Step 3: Cross multiply
    114.05x = 170.72 × 81.45
  4. Step 4: Simplify right side
    114.05x = 13,903.88
  5. Step 5: Solve for x
    x = 13,903.88/114.05
  6. Step 6: Final answer
    x = 121.91

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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.