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Finding the Fourth Proportional to 86.97, 130.28 and 43.57

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Solution

The fourth proportional to 86.97, 130.28 and 43.57 is: 65.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.97 : 130.28 = 43.57 : x
  2. Step 2: Convert to fraction form
    86.97/130.28 = 43.57/x
  3. Step 3: Cross multiply
    86.97x = 130.28 × 43.57
  4. Step 4: Simplify right side
    86.97x = 5,676.30
  5. Step 5: Solve for x
    x = 5,676.30/86.97
  6. Step 6: Final answer
    x = 65.27

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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.