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Finding the Fourth Proportional to 73.53, 110.86 and 66.78

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Solution

The fourth proportional to 73.53, 110.86 and 66.78 is: 100.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.53 : 110.86 = 66.78 : x
  2. Step 2: Convert to fraction form
    73.53/110.86 = 66.78/x
  3. Step 3: Cross multiply
    73.53x = 110.86 × 66.78
  4. Step 4: Simplify right side
    73.53x = 7,403.06
  5. Step 5: Solve for x
    x = 7,403.06/73.53
  6. Step 6: Final answer
    x = 100.68

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.