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Finding the Fourth Proportional to 35.79, 49.38 and 21.97

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Solution

The fourth proportional to 35.79, 49.38 and 21.97 is: 30.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    35.79 : 49.38 = 21.97 : x
  2. Step 2: Convert to fraction form
    35.79/49.38 = 21.97/x
  3. Step 3: Cross multiply
    35.79x = 49.38 × 21.97
  4. Step 4: Simplify right side
    35.79x = 1,084.52
  5. Step 5: Solve for x
    x = 1,084.52/35.79
  6. Step 6: Final answer
    x = 30.31

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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.