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Finding the Fourth Proportional to 5.09, 7.61 and 2.82

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Solution

The fourth proportional to 5.09, 7.61 and 2.82 is: 4.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.09 : 7.61 = 2.82 : x
  2. Step 2: Convert to fraction form
    5.09/7.61 = 2.82/x
  3. Step 3: Cross multiply
    5.09x = 7.61 × 2.82
  4. Step 4: Simplify right side
    5.09x = 21.45
  5. Step 5: Solve for x
    x = 21.45/5.09
  6. Step 6: Final answer
    x = 4.22

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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.