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Finding the Fourth Proportional to 159, 219.39 and 109.80

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Solution

The fourth proportional to 159, 219.39 and 109.80 is: 151.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    159 : 219.39 = 109.80 : x
  2. Step 2: Convert to fraction form
    159/219.39 = 109.80/x
  3. Step 3: Cross multiply
    159x = 219.39 × 109.80
  4. Step 4: Simplify right side
    159x = 24,089.02
  5. Step 5: Solve for x
    x = 24,089.02/159
  6. Step 6: Final answer
    x = 151.50

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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.