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Finding the Fourth Proportional to 2.68, 4 and 2.18

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Solution

The fourth proportional to 2.68, 4 and 2.18 is: 3.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.68 : 4 = 2.18 : x
  2. Step 2: Convert to fraction form
    2.68/4 = 2.18/x
  3. Step 3: Cross multiply
    2.68x = 4 × 2.18
  4. Step 4: Simplify right side
    2.68x = 8.72
  5. Step 5: Solve for x
    x = 8.72/2.68
  6. Step 6: Final answer
    x = 3.25

Related Problems

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Double scale
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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.