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Finding the Fourth Proportional to 82.40, 114.16 and 81.40

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Solution

The fourth proportional to 82.40, 114.16 and 81.40 is: 112.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.40 : 114.16 = 81.40 : x
  2. Step 2: Convert to fraction form
    82.40/114.16 = 81.40/x
  3. Step 3: Cross multiply
    82.40x = 114.16 × 81.40
  4. Step 4: Simplify right side
    82.40x = 9,292.62
  5. Step 5: Solve for x
    x = 9,292.62/82.40
  6. Step 6: Final answer
    x = 112.77

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.