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Finding the Fourth Proportional to 124.28, 186.38 and 51.18

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Solution

The fourth proportional to 124.28, 186.38 and 51.18 is: 76.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.28 : 186.38 = 51.18 : x
  2. Step 2: Convert to fraction form
    124.28/186.38 = 51.18/x
  3. Step 3: Cross multiply
    124.28x = 186.38 × 51.18
  4. Step 4: Simplify right side
    124.28x = 9,538.93
  5. Step 5: Solve for x
    x = 9,538.93/124.28
  6. Step 6: Final answer
    x = 76.75

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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.