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Finding the Fourth Proportional to 26.80, 40.08 and 19.16

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Solution

The fourth proportional to 26.80, 40.08 and 19.16 is: 28.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.80 : 40.08 = 19.16 : x
  2. Step 2: Convert to fraction form
    26.80/40.08 = 19.16/x
  3. Step 3: Cross multiply
    26.80x = 40.08 × 19.16
  4. Step 4: Simplify right side
    26.80x = 767.93
  5. Step 5: Solve for x
    x = 767.93/26.80
  6. Step 6: Final answer
    x = 28.65

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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.