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Finding the Fourth Proportional to 8.49, 11.71 and 7.11

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Solution

The fourth proportional to 8.49, 11.71 and 7.11 is: 9.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.49 : 11.71 = 7.11 : x
  2. Step 2: Convert to fraction form
    8.49/11.71 = 7.11/x
  3. Step 3: Cross multiply
    8.49x = 11.71 × 7.11
  4. Step 4: Simplify right side
    8.49x = 83.20
  5. Step 5: Solve for x
    x = 83.20/8.49
  6. Step 6: Final answer
    x = 9.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.