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Finding the Fourth Proportional to 86.73, 119.69 and 63.48

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Solution

The fourth proportional to 86.73, 119.69 and 63.48 is: 87.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.73 : 119.69 = 63.48 : x
  2. Step 2: Convert to fraction form
    86.73/119.69 = 63.48/x
  3. Step 3: Cross multiply
    86.73x = 119.69 × 63.48
  4. Step 4: Simplify right side
    86.73x = 7,597.60
  5. Step 5: Solve for x
    x = 7,597.60/86.73
  6. Step 6: Final answer
    x = 87.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.