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Finding the Fourth Proportional to 86.97, 120.06 and 54.27

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Solution

The fourth proportional to 86.97, 120.06 and 54.27 is: 74.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.97 : 120.06 = 54.27 : x
  2. Step 2: Convert to fraction form
    86.97/120.06 = 54.27/x
  3. Step 3: Cross multiply
    86.97x = 120.06 × 54.27
  4. Step 4: Simplify right side
    86.97x = 6,515.66
  5. Step 5: Solve for x
    x = 6,515.66/86.97
  6. Step 6: Final answer
    x = 74.92

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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.