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Finding the Fourth Proportional to 34.78, 52.17 and 21.16

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Solution

The fourth proportional to 34.78, 52.17 and 21.16 is: 31.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    34.78 : 52.17 = 21.16 : x
  2. Step 2: Convert to fraction form
    34.78/52.17 = 21.16/x
  3. Step 3: Cross multiply
    34.78x = 52.17 × 21.16
  4. Step 4: Simplify right side
    34.78x = 1,103.98
  5. Step 5: Solve for x
    x = 1,103.98/34.78
  6. Step 6: Final answer
    x = 31.74

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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.