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Finding the Fourth Proportional to 12, 16.56 and 7.69

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Solution

The fourth proportional to 12, 16.56 and 7.69 is: 10.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    12 : 16.56 = 7.69 : x
  2. Step 2: Convert to fraction form
    12/16.56 = 7.69/x
  3. Step 3: Cross multiply
    12x = 16.56 × 7.69
  4. Step 4: Simplify right side
    12x = 127.35
  5. Step 5: Solve for x
    x = 127.35/12
  6. Step 6: Final answer
    x = 10.61

Related Problems

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Double scale
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Similar ratio
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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.