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Finding the Fourth Proportional to 2.67, 4 and 2.10

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Solution

The fourth proportional to 2.67, 4 and 2.10 is: 3.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.67 : 4 = 2.10 : x
  2. Step 2: Convert to fraction form
    2.67/4 = 2.10/x
  3. Step 3: Cross multiply
    2.67x = 4 × 2.10
  4. Step 4: Simplify right side
    2.67x = 8.40
  5. Step 5: Solve for x
    x = 8.40/2.67
  6. Step 6: Final answer
    x = 3.15

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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.