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Finding the Fourth Proportional to 74.76, 111.45 and 66.60

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Solution

The fourth proportional to 74.76, 111.45 and 66.60 is: 99.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.76 : 111.45 = 66.60 : x
  2. Step 2: Convert to fraction form
    74.76/111.45 = 66.60/x
  3. Step 3: Cross multiply
    74.76x = 111.45 × 66.60
  4. Step 4: Simplify right side
    74.76x = 7,422.57
  5. Step 5: Solve for x
    x = 7,422.57/74.76
  6. Step 6: Final answer
    x = 99.29

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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.