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Finding the Fourth Proportional to 74.20, 112.02 and 73.80

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Solution

The fourth proportional to 74.20, 112.02 and 73.80 is: 111.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.20 : 112.02 = 73.80 : x
  2. Step 2: Convert to fraction form
    74.20/112.02 = 73.80/x
  3. Step 3: Cross multiply
    74.20x = 112.02 × 73.80
  4. Step 4: Simplify right side
    74.20x = 8,267.08
  5. Step 5: Solve for x
    x = 8,267.08/74.20
  6. Step 6: Final answer
    x = 111.42

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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.