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Finding the Fourth Proportional to 25.60, 38.24 and 21.08

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Solution

The fourth proportional to 25.60, 38.24 and 21.08 is: 31.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.60 : 38.24 = 21.08 : x
  2. Step 2: Convert to fraction form
    25.60/38.24 = 21.08/x
  3. Step 3: Cross multiply
    25.60x = 38.24 × 21.08
  4. Step 4: Simplify right side
    25.60x = 806.10
  5. Step 5: Solve for x
    x = 806.10/25.60
  6. Step 6: Final answer
    x = 31.49

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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.