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Finding the Fourth Proportional to 86.96, 119.90 and 55.82

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Solution

The fourth proportional to 86.96, 119.90 and 55.82 is: 76.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.96 : 119.90 = 55.82 : x
  2. Step 2: Convert to fraction form
    86.96/119.90 = 55.82/x
  3. Step 3: Cross multiply
    86.96x = 119.90 × 55.82
  4. Step 4: Simplify right side
    86.96x = 6,692.84
  5. Step 5: Solve for x
    x = 6,692.84/86.96
  6. Step 6: Final answer
    x = 76.97

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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.