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Finding the Fourth Proportional to 158.38, 238.65 and 131.92

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Solution

The fourth proportional to 158.38, 238.65 and 131.92 is: 198.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.38 : 238.65 = 131.92 : x
  2. Step 2: Convert to fraction form
    158.38/238.65 = 131.92/x
  3. Step 3: Cross multiply
    158.38x = 238.65 × 131.92
  4. Step 4: Simplify right side
    158.38x = 31,482.71
  5. Step 5: Solve for x
    x = 31,482.71/158.38
  6. Step 6: Final answer
    x = 198.78

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.