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Finding the Fourth Proportional to 82.90, 124.91 and 68.77

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Solution

The fourth proportional to 82.90, 124.91 and 68.77 is: 103.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.90 : 124.91 = 68.77 : x
  2. Step 2: Convert to fraction form
    82.90/124.91 = 68.77/x
  3. Step 3: Cross multiply
    82.90x = 124.91 × 68.77
  4. Step 4: Simplify right side
    82.90x = 8,589.44
  5. Step 5: Solve for x
    x = 8,589.44/82.90
  6. Step 6: Final answer
    x = 103.62

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.