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Finding the Fourth Proportional to 159.80, 220.28 and 153.72

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Solution

The fourth proportional to 159.80, 220.28 and 153.72 is: 211.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.80 : 220.28 = 153.72 : x
  2. Step 2: Convert to fraction form
    159.80/220.28 = 153.72/x
  3. Step 3: Cross multiply
    159.80x = 220.28 × 153.72
  4. Step 4: Simplify right side
    159.80x = 33,860.67
  5. Step 5: Solve for x
    x = 33,860.67/159.80
  6. Step 6: Final answer
    x = 211.90

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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.