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Finding the Fourth Proportional to 5.13, 7.69 and 2.75

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Solution

The fourth proportional to 5.13, 7.69 and 2.75 is: 4.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.13 : 7.69 = 2.75 : x
  2. Step 2: Convert to fraction form
    5.13/7.69 = 2.75/x
  3. Step 3: Cross multiply
    5.13x = 7.69 × 2.75
  4. Step 4: Simplify right side
    5.13x = 21.15
  5. Step 5: Solve for x
    x = 21.15/5.13
  6. Step 6: Final answer
    x = 4.12

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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.