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Finding the Fourth Proportional to 82.19, 123.72 and 74.90

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Solution

The fourth proportional to 82.19, 123.72 and 74.90 is: 112.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.19 : 123.72 = 74.90 : x
  2. Step 2: Convert to fraction form
    82.19/123.72 = 74.90/x
  3. Step 3: Cross multiply
    82.19x = 123.72 × 74.90
  4. Step 4: Simplify right side
    82.19x = 9,267.08
  5. Step 5: Solve for x
    x = 9,267.08/82.19
  6. Step 6: Final answer
    x = 112.75

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.