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Finding the Fourth Proportional to 82.42, 124.15 and 69.87

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Solution

The fourth proportional to 82.42, 124.15 and 69.87 is: 105.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.42 : 124.15 = 69.87 : x
  2. Step 2: Convert to fraction form
    82.42/124.15 = 69.87/x
  3. Step 3: Cross multiply
    82.42x = 124.15 × 69.87
  4. Step 4: Simplify right side
    82.42x = 8,674.36
  5. Step 5: Solve for x
    x = 8,674.36/82.42
  6. Step 6: Final answer
    x = 105.25

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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.