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Finding the Fourth Proportional to 26.13, 36.05 and 15.78

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Solution

The fourth proportional to 26.13, 36.05 and 15.78 is: 21.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.13 : 36.05 = 15.78 : x
  2. Step 2: Convert to fraction form
    26.13/36.05 = 15.78/x
  3. Step 3: Cross multiply
    26.13x = 36.05 × 15.78
  4. Step 4: Simplify right side
    26.13x = 568.71
  5. Step 5: Solve for x
    x = 568.71/26.13
  6. Step 6: Final answer
    x = 21.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.