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Finding the Fourth Proportional to 7.85, 11.78 and 7.18

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Solution

The fourth proportional to 7.85, 11.78 and 7.18 is: 10.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    7.85 : 11.78 = 7.18 : x
  2. Step 2: Convert to fraction form
    7.85/11.78 = 7.18/x
  3. Step 3: Cross multiply
    7.85x = 11.78 × 7.18
  4. Step 4: Simplify right side
    7.85x = 84.58
  5. Step 5: Solve for x
    x = 84.58/7.85
  6. Step 6: Final answer
    x = 10.77

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.