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Finding the Fourth Proportional to 82.14, 122.66 and 69.31

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Solution

The fourth proportional to 82.14, 122.66 and 69.31 is: 103.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.14 : 122.66 = 69.31 : x
  2. Step 2: Convert to fraction form
    82.14/122.66 = 69.31/x
  3. Step 3: Cross multiply
    82.14x = 122.66 × 69.31
  4. Step 4: Simplify right side
    82.14x = 8,501.22
  5. Step 5: Solve for x
    x = 8,501.22/82.14
  6. Step 6: Final answer
    x = 103.50

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.