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Finding the Fourth Proportional to 82.40, 123.08 and 71.04

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Solution

The fourth proportional to 82.40, 123.08 and 71.04 is: 106.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.40 : 123.08 = 71.04 : x
  2. Step 2: Convert to fraction form
    82.40/123.08 = 71.04/x
  3. Step 3: Cross multiply
    82.40x = 123.08 × 71.04
  4. Step 4: Simplify right side
    82.40x = 8,743.60
  5. Step 5: Solve for x
    x = 8,743.60/82.40
  6. Step 6: Final answer
    x = 106.11

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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.