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Finding the Fourth Proportional to 95.85, 143.78 and 86.81

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Solution

The fourth proportional to 95.85, 143.78 and 86.81 is: 130.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    95.85 : 143.78 = 86.81 : x
  2. Step 2: Convert to fraction form
    95.85/143.78 = 86.81/x
  3. Step 3: Cross multiply
    95.85x = 143.78 × 86.81
  4. Step 4: Simplify right side
    95.85x = 12,480.39
  5. Step 5: Solve for x
    x = 12,480.39/95.85
  6. Step 6: Final answer
    x = 130.21

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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.