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Finding the Fourth Proportional to 26.66, 40.05 and 18.69

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Solution

The fourth proportional to 26.66, 40.05 and 18.69 is: 28.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.66 : 40.05 = 18.69 : x
  2. Step 2: Convert to fraction form
    26.66/40.05 = 18.69/x
  3. Step 3: Cross multiply
    26.66x = 40.05 × 18.69
  4. Step 4: Simplify right side
    26.66x = 748.53
  5. Step 5: Solve for x
    x = 748.53/26.66
  6. Step 6: Final answer
    x = 28.08

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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.