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Finding the Fourth Proportional to 74.85, 111.76 and 59.46

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Solution

The fourth proportional to 74.85, 111.76 and 59.46 is: 88.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.85 : 111.76 = 59.46 : x
  2. Step 2: Convert to fraction form
    74.85/111.76 = 59.46/x
  3. Step 3: Cross multiply
    74.85x = 111.76 × 59.46
  4. Step 4: Simplify right side
    74.85x = 6,645.25
  5. Step 5: Solve for x
    x = 6,645.25/74.85
  6. Step 6: Final answer
    x = 88.78

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.