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Finding the Fourth Proportional to 159.80, 219.80 and 129.92

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Solution

The fourth proportional to 159.80, 219.80 and 129.92 is: 178.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.80 : 219.80 = 129.92 : x
  2. Step 2: Convert to fraction form
    159.80/219.80 = 129.92/x
  3. Step 3: Cross multiply
    159.80x = 219.80 × 129.92
  4. Step 4: Simplify right side
    159.80x = 28,555.77
  5. Step 5: Solve for x
    x = 28,555.77/159.80
  6. Step 6: Final answer
    x = 178.70

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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.