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Finding the Fourth Proportional to 82.48, 123.02 and 81.28

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Solution

The fourth proportional to 82.48, 123.02 and 81.28 is: 121.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.48 : 123.02 = 81.28 : x
  2. Step 2: Convert to fraction form
    82.48/123.02 = 81.28/x
  3. Step 3: Cross multiply
    82.48x = 123.02 × 81.28
  4. Step 4: Simplify right side
    82.48x = 9,999.07
  5. Step 5: Solve for x
    x = 9,999.07/82.48
  6. Step 6: Final answer
    x = 121.23

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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.