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Finding the Fourth Proportional to 5.50, 7.55 and 5.09

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Solution

The fourth proportional to 5.50, 7.55 and 5.09 is: 6.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.50 : 7.55 = 5.09 : x
  2. Step 2: Convert to fraction form
    5.50/7.55 = 5.09/x
  3. Step 3: Cross multiply
    5.50x = 7.55 × 5.09
  4. Step 4: Simplify right side
    5.50x = 38.43
  5. Step 5: Solve for x
    x = 38.43/5.50
  6. Step 6: Final answer
    x = 6.99

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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.