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Finding the Fourth Proportional to 124.80, 188.16 and 122.56

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Solution

The fourth proportional to 124.80, 188.16 and 122.56 is: 184.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.80 : 188.16 = 122.56 : x
  2. Step 2: Convert to fraction form
    124.80/188.16 = 122.56/x
  3. Step 3: Cross multiply
    124.80x = 188.16 × 122.56
  4. Step 4: Simplify right side
    124.80x = 23,060.89
  5. Step 5: Solve for x
    x = 23,060.89/124.80
  6. Step 6: Final answer
    x = 184.78

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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.