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Finding the Fourth Proportional to 6.78, 9.36 and 5.57

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Solution

The fourth proportional to 6.78, 9.36 and 5.57 is: 7.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    6.78 : 9.36 = 5.57 : x
  2. Step 2: Convert to fraction form
    6.78/9.36 = 5.57/x
  3. Step 3: Cross multiply
    6.78x = 9.36 × 5.57
  4. Step 4: Simplify right side
    6.78x = 52.09
  5. Step 5: Solve for x
    x = 52.09/6.78
  6. Step 6: Final answer
    x = 7.68

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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.