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Finding the Fourth Proportional to 8.48, 11.72 and 7.81

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Solution

The fourth proportional to 8.48, 11.72 and 7.81 is: 10.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.48 : 11.72 = 7.81 : x
  2. Step 2: Convert to fraction form
    8.48/11.72 = 7.81/x
  3. Step 3: Cross multiply
    8.48x = 11.72 × 7.81
  4. Step 4: Simplify right side
    8.48x = 91.52
  5. Step 5: Solve for x
    x = 91.52/8.48
  6. Step 6: Final answer
    x = 10.79

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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.