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Finding the Fourth Proportional to 126.15, 188.79 and 121.35

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Solution

The fourth proportional to 126.15, 188.79 and 121.35 is: 181.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.15 : 188.79 = 121.35 : x
  2. Step 2: Convert to fraction form
    126.15/188.79 = 121.35/x
  3. Step 3: Cross multiply
    126.15x = 188.79 × 121.35
  4. Step 4: Simplify right side
    126.15x = 22,909.67
  5. Step 5: Solve for x
    x = 22,909.67/126.15
  6. Step 6: Final answer
    x = 181.61

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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.