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Finding the Fourth Proportional to 82.12, 113.29 and 58.85

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Solution

The fourth proportional to 82.12, 113.29 and 58.85 is: 81.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.12 : 113.29 = 58.85 : x
  2. Step 2: Convert to fraction form
    82.12/113.29 = 58.85/x
  3. Step 3: Cross multiply
    82.12x = 113.29 × 58.85
  4. Step 4: Simplify right side
    82.12x = 6,666.26
  5. Step 5: Solve for x
    x = 6,666.26/82.12
  6. Step 6: Final answer
    x = 81.18

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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.