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Finding the Fourth Proportional to 76.98, 115.50 and 66.84

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Solution

The fourth proportional to 76.98, 115.50 and 66.84 is: 100.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.98 : 115.50 = 66.84 : x
  2. Step 2: Convert to fraction form
    76.98/115.50 = 66.84/x
  3. Step 3: Cross multiply
    76.98x = 115.50 × 66.84
  4. Step 4: Simplify right side
    76.98x = 7,720.02
  5. Step 5: Solve for x
    x = 7,720.02/76.98
  6. Step 6: Final answer
    x = 100.29

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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.