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Finding the Fourth Proportional to 159.60, 238.97 and 128.59

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Solution

The fourth proportional to 159.60, 238.97 and 128.59 is: 192.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.60 : 238.97 = 128.59 : x
  2. Step 2: Convert to fraction form
    159.60/238.97 = 128.59/x
  3. Step 3: Cross multiply
    159.60x = 238.97 × 128.59
  4. Step 4: Simplify right side
    159.60x = 30,729.15
  5. Step 5: Solve for x
    x = 30,729.15/159.60
  6. Step 6: Final answer
    x = 192.54

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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.