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Finding the Fourth Proportional to 86.97, 120.08 and 55.92

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Solution

The fourth proportional to 86.97, 120.08 and 55.92 is: 77.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.97 : 120.08 = 55.92 : x
  2. Step 2: Convert to fraction form
    86.97/120.08 = 55.92/x
  3. Step 3: Cross multiply
    86.97x = 120.08 × 55.92
  4. Step 4: Simplify right side
    86.97x = 6,714.87
  5. Step 5: Solve for x
    x = 6,714.87/86.97
  6. Step 6: Final answer
    x = 77.21

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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.