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Finding the Fourth Proportional to 6.85, 10.21 and 6.76

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Solution

The fourth proportional to 6.85, 10.21 and 6.76 is: 10.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    6.85 : 10.21 = 6.76 : x
  2. Step 2: Convert to fraction form
    6.85/10.21 = 6.76/x
  3. Step 3: Cross multiply
    6.85x = 10.21 × 6.76
  4. Step 4: Simplify right side
    6.85x = 69.02
  5. Step 5: Solve for x
    x = 69.02/6.85
  6. Step 6: Final answer
    x = 10.07

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.