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Finding the Fourth Proportional to 82.10, 123.31 and 55.07

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Solution

The fourth proportional to 82.10, 123.31 and 55.07 is: 82.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.10 : 123.31 = 55.07 : x
  2. Step 2: Convert to fraction form
    82.10/123.31 = 55.07/x
  3. Step 3: Cross multiply
    82.10x = 123.31 × 55.07
  4. Step 4: Simplify right side
    82.10x = 6,790.68
  5. Step 5: Solve for x
    x = 6,790.68/82.10
  6. Step 6: Final answer
    x = 82.71

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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.