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Finding the Fourth Proportional to 86.00, 118.70 and 68.54

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Solution

The fourth proportional to 86.00, 118.70 and 68.54 is: 94.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.00 : 118.70 = 68.54 : x
  2. Step 2: Convert to fraction form
    86.00/118.70 = 68.54/x
  3. Step 3: Cross multiply
    86.00x = 118.70 × 68.54
  4. Step 4: Simplify right side
    86.00x = 8,135.70
  5. Step 5: Solve for x
    x = 8,135.70/86.00
  6. Step 6: Final answer
    x = 94.61

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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.