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Finding the Fourth Proportional to 95.96, 143 and 86.84

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Solution

The fourth proportional to 95.96, 143 and 86.84 is: 129.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    95.96 : 143 = 86.84 : x
  2. Step 2: Convert to fraction form
    95.96/143 = 86.84/x
  3. Step 3: Cross multiply
    95.96x = 143 × 86.84
  4. Step 4: Simplify right side
    95.96x = 12,418.12
  5. Step 5: Solve for x
    x = 12,418.12/95.96
  6. Step 6: Final answer
    x = 129.41

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.