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Finding the Fourth Proportional to 26.70, 36.85 and 15.78

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Solution

The fourth proportional to 26.70, 36.85 and 15.78 is: 21.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.70 : 36.85 = 15.78 : x
  2. Step 2: Convert to fraction form
    26.70/36.85 = 15.78/x
  3. Step 3: Cross multiply
    26.70x = 36.85 × 15.78
  4. Step 4: Simplify right side
    26.70x = 581.49
  5. Step 5: Solve for x
    x = 581.49/26.70
  6. Step 6: Final answer
    x = 21.78

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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.