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Finding the Fourth Proportional to 7.48, 11.20 and 6.78

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Solution

The fourth proportional to 7.48, 11.20 and 6.78 is: 10.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    7.48 : 11.20 = 6.78 : x
  2. Step 2: Convert to fraction form
    7.48/11.20 = 6.78/x
  3. Step 3: Cross multiply
    7.48x = 11.20 × 6.78
  4. Step 4: Simplify right side
    7.48x = 75.94
  5. Step 5: Solve for x
    x = 75.94/7.48
  6. Step 6: Final answer
    x = 10.15

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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.