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Finding the Fourth Proportional to 2.18, 3.26 and 1.29

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Solution

The fourth proportional to 2.18, 3.26 and 1.29 is: 1.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.18 : 3.26 = 1.29 : x
  2. Step 2: Convert to fraction form
    2.18/3.26 = 1.29/x
  3. Step 3: Cross multiply
    2.18x = 3.26 × 1.29
  4. Step 4: Simplify right side
    2.18x = 4.18
  5. Step 5: Solve for x
    x = 4.18/2.18
  6. Step 6: Final answer
    x = 1.92

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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.