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Finding the Fourth Proportional to 14.46, 21.70 and 6.85

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Solution

The fourth proportional to 14.46, 21.70 and 6.85 is: 10.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.46 : 21.70 = 6.85 : x
  2. Step 2: Convert to fraction form
    14.46/21.70 = 6.85/x
  3. Step 3: Cross multiply
    14.46x = 21.70 × 6.85
  4. Step 4: Simplify right side
    14.46x = 148.65
  5. Step 5: Solve for x
    x = 148.65/14.46
  6. Step 6: Final answer
    x = 10.28

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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.