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Finding the Fourth Proportional to 27.23, 40.80 and 15.20

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Solution

The fourth proportional to 27.23, 40.80 and 15.20 is: 22.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    27.23 : 40.80 = 15.20 : x
  2. Step 2: Convert to fraction form
    27.23/40.80 = 15.20/x
  3. Step 3: Cross multiply
    27.23x = 40.80 × 15.20
  4. Step 4: Simplify right side
    27.23x = 620.16
  5. Step 5: Solve for x
    x = 620.16/27.23
  6. Step 6: Final answer
    x = 22.77

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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.