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Finding the Fourth Proportional to 2.28, 3.42 and 1.28

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Solution

The fourth proportional to 2.28, 3.42 and 1.28 is: 1.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.28 : 3.42 = 1.28 : x
  2. Step 2: Convert to fraction form
    2.28/3.42 = 1.28/x
  3. Step 3: Cross multiply
    2.28x = 3.42 × 1.28
  4. Step 4: Simplify right side
    2.28x = 4.36
  5. Step 5: Solve for x
    x = 4.36/2.28
  6. Step 6: Final answer
    x = 1.91

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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.