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Finding the Fourth Proportional to 13.05, 18 and 10.76

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Solution

The fourth proportional to 13.05, 18 and 10.76 is: 14.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.05 : 18 = 10.76 : x
  2. Step 2: Convert to fraction form
    13.05/18 = 10.76/x
  3. Step 3: Cross multiply
    13.05x = 18 × 10.76
  4. Step 4: Simplify right side
    13.05x = 193.59
  5. Step 5: Solve for x
    x = 193.59/13.05
  6. Step 6: Final answer
    x = 14.83

Related Problems

Find fourth proportional to 6.53, 9 and 5.38
Half scale
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Double scale
Find fourth proportional to 14.05, 19.38 and 11.76
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.