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Finding the Fourth Proportional to 82.35, 123.12 and 68.58

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Solution

The fourth proportional to 82.35, 123.12 and 68.58 is: 102.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.35 : 123.12 = 68.58 : x
  2. Step 2: Convert to fraction form
    82.35/123.12 = 68.58/x
  3. Step 3: Cross multiply
    82.35x = 123.12 × 68.58
  4. Step 4: Simplify right side
    82.35x = 8,443.57
  5. Step 5: Solve for x
    x = 8,443.57/82.35
  6. Step 6: Final answer
    x = 102.53

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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.