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Finding the Fourth Proportional to 74.40, 111.72 and 73.84

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Solution

The fourth proportional to 74.40, 111.72 and 73.84 is: 110.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.40 : 111.72 = 73.84 : x
  2. Step 2: Convert to fraction form
    74.40/111.72 = 73.84/x
  3. Step 3: Cross multiply
    74.40x = 111.72 × 73.84
  4. Step 4: Simplify right side
    74.40x = 8,249.40
  5. Step 5: Solve for x
    x = 8,249.40/74.40
  6. Step 6: Final answer
    x = 110.88

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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.