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Finding the Fourth Proportional to 12, 18.01 and 7.19

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Solution

The fourth proportional to 12, 18.01 and 7.19 is: 10.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    12 : 18.01 = 7.19 : x
  2. Step 2: Convert to fraction form
    12/18.01 = 7.19/x
  3. Step 3: Cross multiply
    12x = 18.01 × 7.19
  4. Step 4: Simplify right side
    12x = 129.49
  5. Step 5: Solve for x
    x = 129.49/12
  6. Step 6: Final answer
    x = 10.79

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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.