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Finding the Fourth Proportional to 9.69, 13.34 and 7.88

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Solution

The fourth proportional to 9.69, 13.34 and 7.88 is: 10.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.69 : 13.34 = 7.88 : x
  2. Step 2: Convert to fraction form
    9.69/13.34 = 7.88/x
  3. Step 3: Cross multiply
    9.69x = 13.34 × 7.88
  4. Step 4: Simplify right side
    9.69x = 105.01
  5. Step 5: Solve for x
    x = 105.01/9.69
  6. Step 6: Final answer
    x = 10.84

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Find fourth proportional to 4.85, 6.67 and 3.94
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1.5x scale

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.