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Finding the Fourth Proportional to 75.85, 104.67 and 55.15

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Solution

The fourth proportional to 75.85, 104.67 and 55.15 is: 76.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.85 : 104.67 = 55.15 : x
  2. Step 2: Convert to fraction form
    75.85/104.67 = 55.15/x
  3. Step 3: Cross multiply
    75.85x = 104.67 × 55.15
  4. Step 4: Simplify right side
    75.85x = 5,772.55
  5. Step 5: Solve for x
    x = 5,772.55/75.85
  6. Step 6: Final answer
    x = 76.10

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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.