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Finding the Fourth Proportional to 86, 127.68 and 84.56

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Solution

The fourth proportional to 86, 127.68 and 84.56 is: 125.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    86 : 127.68 = 84.56 : x
  2. Step 2: Convert to fraction form
    86/127.68 = 84.56/x
  3. Step 3: Cross multiply
    86x = 127.68 × 84.56
  4. Step 4: Simplify right side
    86x = 10,796.62
  5. Step 5: Solve for x
    x = 10,796.62/86
  6. Step 6: Final answer
    x = 125.54

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.