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Finding the Fourth Proportional to 5.18, 7.77 and 2.61

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Solution

The fourth proportional to 5.18, 7.77 and 2.61 is: 3.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.18 : 7.77 = 2.61 : x
  2. Step 2: Convert to fraction form
    5.18/7.77 = 2.61/x
  3. Step 3: Cross multiply
    5.18x = 7.77 × 2.61
  4. Step 4: Simplify right side
    5.18x = 20.29
  5. Step 5: Solve for x
    x = 20.29/5.18
  6. Step 6: Final answer
    x = 3.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.