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Finding the Fourth Proportional to 21.92, 33 and 18.74

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Solution

The fourth proportional to 21.92, 33 and 18.74 is: 28.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.92 : 33 = 18.74 : x
  2. Step 2: Convert to fraction form
    21.92/33 = 18.74/x
  3. Step 3: Cross multiply
    21.92x = 33 × 18.74
  4. Step 4: Simplify right side
    21.92x = 618.26
  5. Step 5: Solve for x
    x = 618.26/21.92
  6. Step 6: Final answer
    x = 28.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.