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Finding the Fourth Proportional to 5.75, 7.90 and 5.61

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Solution

The fourth proportional to 5.75, 7.90 and 5.61 is: 7.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.75 : 7.90 = 5.61 : x
  2. Step 2: Convert to fraction form
    5.75/7.90 = 5.61/x
  3. Step 3: Cross multiply
    5.75x = 7.90 × 5.61
  4. Step 4: Simplify right side
    5.75x = 44.32
  5. Step 5: Solve for x
    x = 44.32/5.75
  6. Step 6: Final answer
    x = 7.71

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.