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Finding the Fourth Proportional to 159.18, 219.63 and 103.90

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Solution

The fourth proportional to 159.18, 219.63 and 103.90 is: 143.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.18 : 219.63 = 103.90 : x
  2. Step 2: Convert to fraction form
    159.18/219.63 = 103.90/x
  3. Step 3: Cross multiply
    159.18x = 219.63 × 103.90
  4. Step 4: Simplify right side
    159.18x = 22,819.56
  5. Step 5: Solve for x
    x = 22,819.56/159.18
  6. Step 6: Final answer
    x = 143.36

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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.