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Finding the Fourth Proportional to 29.49, 40.73 and 21.28

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Solution

The fourth proportional to 29.49, 40.73 and 21.28 is: 29.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.49 : 40.73 = 21.28 : x
  2. Step 2: Convert to fraction form
    29.49/40.73 = 21.28/x
  3. Step 3: Cross multiply
    29.49x = 40.73 × 21.28
  4. Step 4: Simplify right side
    29.49x = 866.73
  5. Step 5: Solve for x
    x = 866.73/29.49
  6. Step 6: Final answer
    x = 29.39

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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.