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Finding the Fourth Proportional to 73.74, 110.45 and 43.21

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Solution

The fourth proportional to 73.74, 110.45 and 43.21 is: 64.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.74 : 110.45 = 43.21 : x
  2. Step 2: Convert to fraction form
    73.74/110.45 = 43.21/x
  3. Step 3: Cross multiply
    73.74x = 110.45 × 43.21
  4. Step 4: Simplify right side
    73.74x = 4,772.54
  5. Step 5: Solve for x
    x = 4,772.54/73.74
  6. Step 6: Final answer
    x = 64.72

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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.