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Finding the Fourth Proportional to 159.09, 219.51 and 103.80

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Solution

The fourth proportional to 159.09, 219.51 and 103.80 is: 143.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.09 : 219.51 = 103.80 : x
  2. Step 2: Convert to fraction form
    159.09/219.51 = 103.80/x
  3. Step 3: Cross multiply
    159.09x = 219.51 × 103.80
  4. Step 4: Simplify right side
    159.09x = 22,785.14
  5. Step 5: Solve for x
    x = 22,785.14/159.09
  6. Step 6: Final answer
    x = 143.22

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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.