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Finding the Fourth Proportional to 82.19, 123.21 and 61.88

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Solution

The fourth proportional to 82.19, 123.21 and 61.88 is: 92.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.19 : 123.21 = 61.88 : x
  2. Step 2: Convert to fraction form
    82.19/123.21 = 61.88/x
  3. Step 3: Cross multiply
    82.19x = 123.21 × 61.88
  4. Step 4: Simplify right side
    82.19x = 7,624.23
  5. Step 5: Solve for x
    x = 7,624.23/82.19
  6. Step 6: Final answer
    x = 92.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.