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Finding the Fourth Proportional to 86.56, 128.88 and 83.44

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Solution

The fourth proportional to 86.56, 128.88 and 83.44 is: 124.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.56 : 128.88 = 83.44 : x
  2. Step 2: Convert to fraction form
    86.56/128.88 = 83.44/x
  3. Step 3: Cross multiply
    86.56x = 128.88 × 83.44
  4. Step 4: Simplify right side
    86.56x = 10,753.75
  5. Step 5: Solve for x
    x = 10,753.75/86.56
  6. Step 6: Final answer
    x = 124.23

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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.