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Finding the Fourth Proportional to 86.68, 130.20 and 81.64

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Solution

The fourth proportional to 86.68, 130.20 and 81.64 is: 122.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.68 : 130.20 = 81.64 : x
  2. Step 2: Convert to fraction form
    86.68/130.20 = 81.64/x
  3. Step 3: Cross multiply
    86.68x = 130.20 × 81.64
  4. Step 4: Simplify right side
    86.68x = 10,629.53
  5. Step 5: Solve for x
    x = 10,629.53/86.68
  6. Step 6: Final answer
    x = 122.63

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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.