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Finding the Fourth Proportional to 6.99, 9.61 and 6.18

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Solution

The fourth proportional to 6.99, 9.61 and 6.18 is: 8.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    6.99 : 9.61 = 6.18 : x
  2. Step 2: Convert to fraction form
    6.99/9.61 = 6.18/x
  3. Step 3: Cross multiply
    6.99x = 9.61 × 6.18
  4. Step 4: Simplify right side
    6.99x = 59.39
  5. Step 5: Solve for x
    x = 59.39/6.99
  6. Step 6: Final answer
    x = 8.50

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.