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Finding the Fourth Proportional to 159.85, 239.78 and 142.03

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Solution

The fourth proportional to 159.85, 239.78 and 142.03 is: 213.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.85 : 239.78 = 142.03 : x
  2. Step 2: Convert to fraction form
    159.85/239.78 = 142.03/x
  3. Step 3: Cross multiply
    159.85x = 239.78 × 142.03
  4. Step 4: Simplify right side
    159.85x = 34,055.95
  5. Step 5: Solve for x
    x = 34,055.95/159.85
  6. Step 6: Final answer
    x = 213.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.