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Finding the Fourth Proportional to 82.45, 123.39 and 52.03

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Solution

The fourth proportional to 82.45, 123.39 and 52.03 is: 77.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.45 : 123.39 = 52.03 : x
  2. Step 2: Convert to fraction form
    82.45/123.39 = 52.03/x
  3. Step 3: Cross multiply
    82.45x = 123.39 × 52.03
  4. Step 4: Simplify right side
    82.45x = 6,419.98
  5. Step 5: Solve for x
    x = 6,419.98/82.45
  6. Step 6: Final answer
    x = 77.87

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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.