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Finding the Fourth Proportional to 159.90, 220.12 and 139.09

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Solution

The fourth proportional to 159.90, 220.12 and 139.09 is: 191.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.90 : 220.12 = 139.09 : x
  2. Step 2: Convert to fraction form
    159.90/220.12 = 139.09/x
  3. Step 3: Cross multiply
    159.90x = 220.12 × 139.09
  4. Step 4: Simplify right side
    159.90x = 30,616.49
  5. Step 5: Solve for x
    x = 30,616.49/159.90
  6. Step 6: Final answer
    x = 191.47

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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.