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Finding the Fourth Proportional to 82.13, 113.21 and 62.69

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Solution

The fourth proportional to 82.13, 113.21 and 62.69 is: 86.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.13 : 113.21 = 62.69 : x
  2. Step 2: Convert to fraction form
    82.13/113.21 = 62.69/x
  3. Step 3: Cross multiply
    82.13x = 113.21 × 62.69
  4. Step 4: Simplify right side
    82.13x = 7,097.13
  5. Step 5: Solve for x
    x = 7,097.13/82.13
  6. Step 6: Final answer
    x = 86.41

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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.