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Finding the Fourth Proportional to 159.42, 220.15 and 104.21

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Solution

The fourth proportional to 159.42, 220.15 and 104.21 is: 143.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.42 : 220.15 = 104.21 : x
  2. Step 2: Convert to fraction form
    159.42/220.15 = 104.21/x
  3. Step 3: Cross multiply
    159.42x = 220.15 × 104.21
  4. Step 4: Simplify right side
    159.42x = 22,941.83
  5. Step 5: Solve for x
    x = 22,941.83/159.42
  6. Step 6: Final answer
    x = 143.91

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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.