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Finding the Fourth Proportional to 34.15, 51.24 and 20.65

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Solution

The fourth proportional to 34.15, 51.24 and 20.65 is: 30.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    34.15 : 51.24 = 20.65 : x
  2. Step 2: Convert to fraction form
    34.15/51.24 = 20.65/x
  3. Step 3: Cross multiply
    34.15x = 51.24 × 20.65
  4. Step 4: Simplify right side
    34.15x = 1,058.11
  5. Step 5: Solve for x
    x = 1,058.11/34.15
  6. Step 6: Final answer
    x = 30.98

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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.