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Finding the Fourth Proportional to 13.05, 18 and 9.39

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Solution

The fourth proportional to 13.05, 18 and 9.39 is: 12.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.05 : 18 = 9.39 : x
  2. Step 2: Convert to fraction form
    13.05/18 = 9.39/x
  3. Step 3: Cross multiply
    13.05x = 18 × 9.39
  4. Step 4: Simplify right side
    13.05x = 169.02
  5. Step 5: Solve for x
    x = 169.02/13.05
  6. Step 6: Final answer
    x = 12.95

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.