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Finding the Fourth Proportional to 124.48, 186.84 and 83.76

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Solution

The fourth proportional to 124.48, 186.84 and 83.76 is: 125.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.48 : 186.84 = 83.76 : x
  2. Step 2: Convert to fraction form
    124.48/186.84 = 83.76/x
  3. Step 3: Cross multiply
    124.48x = 186.84 × 83.76
  4. Step 4: Simplify right side
    124.48x = 15,649.72
  5. Step 5: Solve for x
    x = 15,649.72/124.48
  6. Step 6: Final answer
    x = 125.72

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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.