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Finding the Fourth Proportional to 130.85, 195.74 and 87.11

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Solution

The fourth proportional to 130.85, 195.74 and 87.11 is: 130.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.85 : 195.74 = 87.11 : x
  2. Step 2: Convert to fraction form
    130.85/195.74 = 87.11/x
  3. Step 3: Cross multiply
    130.85x = 195.74 × 87.11
  4. Step 4: Simplify right side
    130.85x = 17,049.50
  5. Step 5: Solve for x
    x = 17,049.50/130.85
  6. Step 6: Final answer
    x = 130.30

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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.