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Finding the Fourth Proportional to 86.99, 120.01 and 55.49

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Solution

The fourth proportional to 86.99, 120.01 and 55.49 is: 76.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.99 : 120.01 = 55.49 : x
  2. Step 2: Convert to fraction form
    86.99/120.01 = 55.49/x
  3. Step 3: Cross multiply
    86.99x = 120.01 × 55.49
  4. Step 4: Simplify right side
    86.99x = 6,659.08
  5. Step 5: Solve for x
    x = 6,659.08/86.99
  6. Step 6: Final answer
    x = 76.55

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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.