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Finding the Fourth Proportional to 74.45, 111.68 and 60.78

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Solution

The fourth proportional to 74.45, 111.68 and 60.78 is: 91.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.45 : 111.68 = 60.78 : x
  2. Step 2: Convert to fraction form
    74.45/111.68 = 60.78/x
  3. Step 3: Cross multiply
    74.45x = 111.68 × 60.78
  4. Step 4: Simplify right side
    74.45x = 6,788.25
  5. Step 5: Solve for x
    x = 6,788.25/74.45
  6. Step 6: Final answer
    x = 91.18

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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.