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Finding the Fourth Proportional to 82.55, 123.83 and 39.23

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Solution

The fourth proportional to 82.55, 123.83 and 39.23 is: 58.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.55 : 123.83 = 39.23 : x
  2. Step 2: Convert to fraction form
    82.55/123.83 = 39.23/x
  3. Step 3: Cross multiply
    82.55x = 123.83 × 39.23
  4. Step 4: Simplify right side
    82.55x = 4,858.34
  5. Step 5: Solve for x
    x = 4,858.34/82.55
  6. Step 6: Final answer
    x = 58.85

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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.