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Finding the Fourth Proportional to 21.43, 32.28 and 19.32

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Solution

The fourth proportional to 21.43, 32.28 and 19.32 is: 29.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.43 : 32.28 = 19.32 : x
  2. Step 2: Convert to fraction form
    21.43/32.28 = 19.32/x
  3. Step 3: Cross multiply
    21.43x = 32.28 × 19.32
  4. Step 4: Simplify right side
    21.43x = 623.49
  5. Step 5: Solve for x
    x = 623.49/21.43
  6. Step 6: Final answer
    x = 29.09

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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.