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Finding the Fourth Proportional to 159.86, 238.47 and 140.42

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Solution

The fourth proportional to 159.86, 238.47 and 140.42 is: 209.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.86 : 238.47 = 140.42 : x
  2. Step 2: Convert to fraction form
    159.86/238.47 = 140.42/x
  3. Step 3: Cross multiply
    159.86x = 238.47 × 140.42
  4. Step 4: Simplify right side
    159.86x = 33,485.26
  5. Step 5: Solve for x
    x = 33,485.26/159.86
  6. Step 6: Final answer
    x = 209.47

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.