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Finding the Fourth Proportional to 21.73, 30.13 and 21.46

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Solution

The fourth proportional to 21.73, 30.13 and 21.46 is: 29.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.73 : 30.13 = 21.46 : x
  2. Step 2: Convert to fraction form
    21.73/30.13 = 21.46/x
  3. Step 3: Cross multiply
    21.73x = 30.13 × 21.46
  4. Step 4: Simplify right side
    21.73x = 646.59
  5. Step 5: Solve for x
    x = 646.59/21.73
  6. Step 6: Final answer
    x = 29.76

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.