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Finding the Fourth Proportional to 82.99, 114.36 and 81.66

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Solution

The fourth proportional to 82.99, 114.36 and 81.66 is: 112.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.99 : 114.36 = 81.66 : x
  2. Step 2: Convert to fraction form
    82.99/114.36 = 81.66/x
  3. Step 3: Cross multiply
    82.99x = 114.36 × 81.66
  4. Step 4: Simplify right side
    82.99x = 9,338.74
  5. Step 5: Solve for x
    x = 9,338.74/82.99
  6. Step 6: Final answer
    x = 112.53

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.