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Finding the Fourth Proportional to 7.68, 10.59 and 6.78

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Solution

The fourth proportional to 7.68, 10.59 and 6.78 is: 9.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    7.68 : 10.59 = 6.78 : x
  2. Step 2: Convert to fraction form
    7.68/10.59 = 6.78/x
  3. Step 3: Cross multiply
    7.68x = 10.59 × 6.78
  4. Step 4: Simplify right side
    7.68x = 71.80
  5. Step 5: Solve for x
    x = 71.80/7.68
  6. Step 6: Final answer
    x = 9.35

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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.