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Finding the Fourth Proportional to 26.35, 39.45 and 20.91

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Solution

The fourth proportional to 26.35, 39.45 and 20.91 is: 31.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.35 : 39.45 = 20.91 : x
  2. Step 2: Convert to fraction form
    26.35/39.45 = 20.91/x
  3. Step 3: Cross multiply
    26.35x = 39.45 × 20.91
  4. Step 4: Simplify right side
    26.35x = 824.90
  5. Step 5: Solve for x
    x = 824.90/26.35
  6. Step 6: Final answer
    x = 31.31

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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.