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Finding the Fourth Proportional to 5.72, 7.85 and 5.18

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Solution

The fourth proportional to 5.72, 7.85 and 5.18 is: 7.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.72 : 7.85 = 5.18 : x
  2. Step 2: Convert to fraction form
    5.72/7.85 = 5.18/x
  3. Step 3: Cross multiply
    5.72x = 7.85 × 5.18
  4. Step 4: Simplify right side
    5.72x = 40.66
  5. Step 5: Solve for x
    x = 40.66/5.72
  6. Step 6: Final answer
    x = 7.11

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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.