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Finding the Fourth Proportional to 86.82, 130.24 and 68.76

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Solution

The fourth proportional to 86.82, 130.24 and 68.76 is: 103.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.82 : 130.24 = 68.76 : x
  2. Step 2: Convert to fraction form
    86.82/130.24 = 68.76/x
  3. Step 3: Cross multiply
    86.82x = 130.24 × 68.76
  4. Step 4: Simplify right side
    86.82x = 8,955.30
  5. Step 5: Solve for x
    x = 8,955.30/86.82
  6. Step 6: Final answer
    x = 103.15

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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.