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Finding the Fourth Proportional to 82.77, 124.15 and 76.69

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Solution

The fourth proportional to 82.77, 124.15 and 76.69 is: 115.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.77 : 124.15 = 76.69 : x
  2. Step 2: Convert to fraction form
    82.77/124.15 = 76.69/x
  3. Step 3: Cross multiply
    82.77x = 124.15 × 76.69
  4. Step 4: Simplify right side
    82.77x = 9,521.06
  5. Step 5: Solve for x
    x = 9,521.06/82.77
  6. Step 6: Final answer
    x = 115.03

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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.