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Finding the Fourth Proportional to 74.76, 112.16 and 26.72

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Solution

The fourth proportional to 74.76, 112.16 and 26.72 is: 40.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.76 : 112.16 = 26.72 : x
  2. Step 2: Convert to fraction form
    74.76/112.16 = 26.72/x
  3. Step 3: Cross multiply
    74.76x = 112.16 × 26.72
  4. Step 4: Simplify right side
    74.76x = 2,996.92
  5. Step 5: Solve for x
    x = 2,996.92/74.76
  6. Step 6: Final answer
    x = 40.09

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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.