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Finding the Fourth Proportional to 75.85, 113.49 and 66.67

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Solution

The fourth proportional to 75.85, 113.49 and 66.67 is: 99.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.85 : 113.49 = 66.67 : x
  2. Step 2: Convert to fraction form
    75.85/113.49 = 66.67/x
  3. Step 3: Cross multiply
    75.85x = 113.49 × 66.67
  4. Step 4: Simplify right side
    75.85x = 7,566.38
  5. Step 5: Solve for x
    x = 7,566.38/75.85
  6. Step 6: Final answer
    x = 99.75

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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.