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Finding the Fourth Proportional to 159.11, 219.51 and 109.91

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Solution

The fourth proportional to 159.11, 219.51 and 109.91 is: 151.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.11 : 219.51 = 109.91 : x
  2. Step 2: Convert to fraction form
    159.11/219.51 = 109.91/x
  3. Step 3: Cross multiply
    159.11x = 219.51 × 109.91
  4. Step 4: Simplify right side
    159.11x = 24,125.66
  5. Step 5: Solve for x
    x = 24,125.66/159.11
  6. Step 6: Final answer
    x = 151.62

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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.