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Finding the Fourth Proportional to 185.75, 278.43 and 130.90

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Solution

The fourth proportional to 185.75, 278.43 and 130.90 is: 196.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.75 : 278.43 = 130.90 : x
  2. Step 2: Convert to fraction form
    185.75/278.43 = 130.90/x
  3. Step 3: Cross multiply
    185.75x = 278.43 × 130.90
  4. Step 4: Simplify right side
    185.75x = 36,445.87
  5. Step 5: Solve for x
    x = 36,445.87/185.75
  6. Step 6: Final answer
    x = 196.21

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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.