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Finding the Fourth Proportional to 151.56, 209.16 and 104.91

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Solution

The fourth proportional to 151.56, 209.16 and 104.91 is: 144.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.56 : 209.16 = 104.91 : x
  2. Step 2: Convert to fraction form
    151.56/209.16 = 104.91/x
  3. Step 3: Cross multiply
    151.56x = 209.16 × 104.91
  4. Step 4: Simplify right side
    151.56x = 21,942.98
  5. Step 5: Solve for x
    x = 21,942.98/151.56
  6. Step 6: Final answer
    x = 144.78

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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.