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Finding the Fourth Proportional to 82.99, 124.21 and 77.91

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Solution

The fourth proportional to 82.99, 124.21 and 77.91 is: 116.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.99 : 124.21 = 77.91 : x
  2. Step 2: Convert to fraction form
    82.99/124.21 = 77.91/x
  3. Step 3: Cross multiply
    82.99x = 124.21 × 77.91
  4. Step 4: Simplify right side
    82.99x = 9,677.20
  5. Step 5: Solve for x
    x = 9,677.20/82.99
  6. Step 6: Final answer
    x = 116.61

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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.