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Finding the Fourth Proportional to 25.68, 35.39 and 21.57

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Solution

The fourth proportional to 25.68, 35.39 and 21.57 is: 29.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.68 : 35.39 = 21.57 : x
  2. Step 2: Convert to fraction form
    25.68/35.39 = 21.57/x
  3. Step 3: Cross multiply
    25.68x = 35.39 × 21.57
  4. Step 4: Simplify right side
    25.68x = 763.25
  5. Step 5: Solve for x
    x = 763.25/25.68
  6. Step 6: Final answer
    x = 29.72

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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.