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Finding the Fourth Proportional to 6.99, 10.42 and 6.69

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Solution

The fourth proportional to 6.99, 10.42 and 6.69 is: 9.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    6.99 : 10.42 = 6.69 : x
  2. Step 2: Convert to fraction form
    6.99/10.42 = 6.69/x
  3. Step 3: Cross multiply
    6.99x = 10.42 × 6.69
  4. Step 4: Simplify right side
    6.99x = 69.71
  5. Step 5: Solve for x
    x = 69.71/6.99
  6. Step 6: Final answer
    x = 9.97

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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.