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Finding the Fourth Proportional to 82.04, 112.45 and 81.90

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Solution

The fourth proportional to 82.04, 112.45 and 81.90 is: 112.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.04 : 112.45 = 81.90 : x
  2. Step 2: Convert to fraction form
    82.04/112.45 = 81.90/x
  3. Step 3: Cross multiply
    82.04x = 112.45 × 81.90
  4. Step 4: Simplify right side
    82.04x = 9,209.66
  5. Step 5: Solve for x
    x = 9,209.66/82.04
  6. Step 6: Final answer
    x = 112.26

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.