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Finding the Fourth Proportional to 76.66, 115 and 27.90

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Solution

The fourth proportional to 76.66, 115 and 27.90 is: 41.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.66 : 115 = 27.90 : x
  2. Step 2: Convert to fraction form
    76.66/115 = 27.90/x
  3. Step 3: Cross multiply
    76.66x = 115 × 27.90
  4. Step 4: Simplify right side
    76.66x = 3,208.50
  5. Step 5: Solve for x
    x = 3,208.50/76.66
  6. Step 6: Final answer
    x = 41.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.