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Finding the Fourth Proportional to 27.80, 41.64 and 22.40

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Solution

The fourth proportional to 27.80, 41.64 and 22.40 is: 33.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    27.80 : 41.64 = 22.40 : x
  2. Step 2: Convert to fraction form
    27.80/41.64 = 22.40/x
  3. Step 3: Cross multiply
    27.80x = 41.64 × 22.40
  4. Step 4: Simplify right side
    27.80x = 932.74
  5. Step 5: Solve for x
    x = 932.74/27.80
  6. Step 6: Final answer
    x = 33.55

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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.