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Finding the Fourth Proportional to 146.78, 220.07 and 69.76

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Solution

The fourth proportional to 146.78, 220.07 and 69.76 is: 104.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.78 : 220.07 = 69.76 : x
  2. Step 2: Convert to fraction form
    146.78/220.07 = 69.76/x
  3. Step 3: Cross multiply
    146.78x = 220.07 × 69.76
  4. Step 4: Simplify right side
    146.78x = 15,352.08
  5. Step 5: Solve for x
    x = 15,352.08/146.78
  6. Step 6: Final answer
    x = 104.59

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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.