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Finding the Fourth Proportional to 26.08, 38.96 and 21

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Solution

The fourth proportional to 26.08, 38.96 and 21 is: 31.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.08 : 38.96 = 21 : x
  2. Step 2: Convert to fraction form
    26.08/38.96 = 21/x
  3. Step 3: Cross multiply
    26.08x = 38.96 × 21
  4. Step 4: Simplify right side
    26.08x = 818.16
  5. Step 5: Solve for x
    x = 818.16/26.08
  6. Step 6: Final answer
    x = 31.37

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.