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Finding the Fourth Proportional to 159.20, 219.64 and 100.24

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Solution

The fourth proportional to 159.20, 219.64 and 100.24 is: 138.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.20 : 219.64 = 100.24 : x
  2. Step 2: Convert to fraction form
    159.20/219.64 = 100.24/x
  3. Step 3: Cross multiply
    159.20x = 219.64 × 100.24
  4. Step 4: Simplify right side
    159.20x = 22,016.71
  5. Step 5: Solve for x
    x = 22,016.71/159.20
  6. Step 6: Final answer
    x = 138.30

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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.