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Finding the Fourth Proportional to 5.18, 7.81 and 5.08

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Solution

The fourth proportional to 5.18, 7.81 and 5.08 is: 7.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.18 : 7.81 = 5.08 : x
  2. Step 2: Convert to fraction form
    5.18/7.81 = 5.08/x
  3. Step 3: Cross multiply
    5.18x = 7.81 × 5.08
  4. Step 4: Simplify right side
    5.18x = 39.67
  5. Step 5: Solve for x
    x = 39.67/5.18
  6. Step 6: Final answer
    x = 7.66

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.