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Finding the Fourth Proportional to 22.64, 33.76 and 21.15

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Solution

The fourth proportional to 22.64, 33.76 and 21.15 is: 31.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.64 : 33.76 = 21.15 : x
  2. Step 2: Convert to fraction form
    22.64/33.76 = 21.15/x
  3. Step 3: Cross multiply
    22.64x = 33.76 × 21.15
  4. Step 4: Simplify right side
    22.64x = 714.02
  5. Step 5: Solve for x
    x = 714.02/22.64
  6. Step 6: Final answer
    x = 31.54

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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.