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Finding the Fourth Proportional to 151.90, 209.43 and 118.78

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Solution

The fourth proportional to 151.90, 209.43 and 118.78 is: 163.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.90 : 209.43 = 118.78 : x
  2. Step 2: Convert to fraction form
    151.90/209.43 = 118.78/x
  3. Step 3: Cross multiply
    151.90x = 209.43 × 118.78
  4. Step 4: Simplify right side
    151.90x = 24,876.10
  5. Step 5: Solve for x
    x = 24,876.10/151.90
  6. Step 6: Final answer
    x = 163.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.