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Finding the Fourth Proportional to 2.69, 4 and 2.61

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Solution

The fourth proportional to 2.69, 4 and 2.61 is: 3.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.69 : 4 = 2.61 : x
  2. Step 2: Convert to fraction form
    2.69/4 = 2.61/x
  3. Step 3: Cross multiply
    2.69x = 4 × 2.61
  4. Step 4: Simplify right side
    2.69x = 10.44
  5. Step 5: Solve for x
    x = 10.44/2.69
  6. Step 6: Final answer
    x = 3.88

Related Problems

Find fourth proportional to 1.35, 2 and 1.31
Half scale
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Double scale
Find fourth proportional to 3.69, 5.49 and 3.61
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.