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Finding the Fourth Proportional to 74.81, 112.21 and 26.72

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Solution

The fourth proportional to 74.81, 112.21 and 26.72 is: 40.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.81 : 112.21 = 26.72 : x
  2. Step 2: Convert to fraction form
    74.81/112.21 = 26.72/x
  3. Step 3: Cross multiply
    74.81x = 112.21 × 26.72
  4. Step 4: Simplify right side
    74.81x = 2,997.69
  5. Step 5: Solve for x
    x = 2,997.69/74.81
  6. Step 6: Final answer
    x = 40.07

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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.