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Finding the Fourth Proportional to 185.61, 278.13 and 131.40

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Solution

The fourth proportional to 185.61, 278.13 and 131.40 is: 196.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.61 : 278.13 = 131.40 : x
  2. Step 2: Convert to fraction form
    185.61/278.13 = 131.40/x
  3. Step 3: Cross multiply
    185.61x = 278.13 × 131.40
  4. Step 4: Simplify right side
    185.61x = 36,546.28
  5. Step 5: Solve for x
    x = 36,546.28/185.61
  6. Step 6: Final answer
    x = 196.90

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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.