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Finding the Fourth Proportional to 82.60, 123.87 and 28.47

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Solution

The fourth proportional to 82.60, 123.87 and 28.47 is: 42.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.60 : 123.87 = 28.47 : x
  2. Step 2: Convert to fraction form
    82.60/123.87 = 28.47/x
  3. Step 3: Cross multiply
    82.60x = 123.87 × 28.47
  4. Step 4: Simplify right side
    82.60x = 3,527.15
  5. Step 5: Solve for x
    x = 3,527.15/82.60
  6. Step 6: Final answer
    x = 42.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.