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Finding the Fourth Proportional to 34.38, 51.47 and 21.51

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Solution

The fourth proportional to 34.38, 51.47 and 21.51 is: 32.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    34.38 : 51.47 = 21.51 : x
  2. Step 2: Convert to fraction form
    34.38/51.47 = 21.51/x
  3. Step 3: Cross multiply
    34.38x = 51.47 × 21.51
  4. Step 4: Simplify right side
    34.38x = 1,107.09
  5. Step 5: Solve for x
    x = 1,107.09/34.38
  6. Step 6: Final answer
    x = 32.20

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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.