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Finding the Fourth Proportional to 5.12, 7.08 and 3.68

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Solution

The fourth proportional to 5.12, 7.08 and 3.68 is: 5.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.12 : 7.08 = 3.68 : x
  2. Step 2: Convert to fraction form
    5.12/7.08 = 3.68/x
  3. Step 3: Cross multiply
    5.12x = 7.08 × 3.68
  4. Step 4: Simplify right side
    5.12x = 26.05
  5. Step 5: Solve for x
    x = 26.05/5.12
  6. Step 6: Final answer
    x = 5.09

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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.