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Finding the Fourth Proportional to 159.80, 220.59 and 113.21

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Solution

The fourth proportional to 159.80, 220.59 and 113.21 is: 156.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.80 : 220.59 = 113.21 : x
  2. Step 2: Convert to fraction form
    159.80/220.59 = 113.21/x
  3. Step 3: Cross multiply
    159.80x = 220.59 × 113.21
  4. Step 4: Simplify right side
    159.80x = 24,972.99
  5. Step 5: Solve for x
    x = 24,972.99/159.80
  6. Step 6: Final answer
    x = 156.28

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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.