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Finding the Fourth Proportional to 22.47, 30.96 and 21.51

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Solution

The fourth proportional to 22.47, 30.96 and 21.51 is: 29.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.47 : 30.96 = 21.51 : x
  2. Step 2: Convert to fraction form
    22.47/30.96 = 21.51/x
  3. Step 3: Cross multiply
    22.47x = 30.96 × 21.51
  4. Step 4: Simplify right side
    22.47x = 665.95
  5. Step 5: Solve for x
    x = 665.95/22.47
  6. Step 6: Final answer
    x = 29.64

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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.