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Finding the Fourth Proportional to 39.97, 59.83 and 21.64

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Solution

The fourth proportional to 39.97, 59.83 and 21.64 is: 32.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.97 : 59.83 = 21.64 : x
  2. Step 2: Convert to fraction form
    39.97/59.83 = 21.64/x
  3. Step 3: Cross multiply
    39.97x = 59.83 × 21.64
  4. Step 4: Simplify right side
    39.97x = 1,294.72
  5. Step 5: Solve for x
    x = 1,294.72/39.97
  6. Step 6: Final answer
    x = 32.39

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.