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Finding the Fourth Proportional to 39.39, 59.13 and 21.38

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Solution

The fourth proportional to 39.39, 59.13 and 21.38 is: 32.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.39 : 59.13 = 21.38 : x
  2. Step 2: Convert to fraction form
    39.39/59.13 = 21.38/x
  3. Step 3: Cross multiply
    39.39x = 59.13 × 21.38
  4. Step 4: Simplify right side
    39.39x = 1,263.90
  5. Step 5: Solve for x
    x = 1,263.90/39.39
  6. Step 6: Final answer
    x = 32.09

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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.