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Finding the Fourth Proportional to 82.98, 123.63 and 79.11

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Solution

The fourth proportional to 82.98, 123.63 and 79.11 is: 117.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.98 : 123.63 = 79.11 : x
  2. Step 2: Convert to fraction form
    82.98/123.63 = 79.11/x
  3. Step 3: Cross multiply
    82.98x = 123.63 × 79.11
  4. Step 4: Simplify right side
    82.98x = 9,780.37
  5. Step 5: Solve for x
    x = 9,780.37/82.98
  6. Step 6: Final answer
    x = 117.86

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.