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Finding the Fourth Proportional to 82.61, 113.18 and 79.66

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Solution

The fourth proportional to 82.61, 113.18 and 79.66 is: 109.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.61 : 113.18 = 79.66 : x
  2. Step 2: Convert to fraction form
    82.61/113.18 = 79.66/x
  3. Step 3: Cross multiply
    82.61x = 113.18 × 79.66
  4. Step 4: Simplify right side
    82.61x = 9,015.24
  5. Step 5: Solve for x
    x = 9,015.24/82.61
  6. Step 6: Final answer
    x = 109.13

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.