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Finding the Fourth Proportional to 3.10, 4.28 and 1.89

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Solution

The fourth proportional to 3.10, 4.28 and 1.89 is: 2.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    3.10 : 4.28 = 1.89 : x
  2. Step 2: Convert to fraction form
    3.10/4.28 = 1.89/x
  3. Step 3: Cross multiply
    3.10x = 4.28 × 1.89
  4. Step 4: Simplify right side
    3.10x = 8.06
  5. Step 5: Solve for x
    x = 8.06/3.10
  6. Step 6: Final answer
    x = 2.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.