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Finding the Fourth Proportional to 25, 37.56 and 21.82

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Solution

The fourth proportional to 25, 37.56 and 21.82 is: 32.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    25 : 37.56 = 21.82 : x
  2. Step 2: Convert to fraction form
    25/37.56 = 21.82/x
  3. Step 3: Cross multiply
    25x = 37.56 × 21.82
  4. Step 4: Simplify right side
    25x = 819.56
  5. Step 5: Solve for x
    x = 819.56/25
  6. Step 6: Final answer
    x = 32.78

Related Problems

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1.5x scale

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.