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Finding the Fourth Proportional to 124.80, 186 and 121.28

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Solution

The fourth proportional to 124.80, 186 and 121.28 is: 180.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.80 : 186 = 121.28 : x
  2. Step 2: Convert to fraction form
    124.80/186 = 121.28/x
  3. Step 3: Cross multiply
    124.80x = 186 × 121.28
  4. Step 4: Simplify right side
    124.80x = 22,558.08
  5. Step 5: Solve for x
    x = 22,558.08/124.80
  6. Step 6: Final answer
    x = 180.75

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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.