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Finding the Fourth Proportional to 5.61, 8.42 and 2.61

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Solution

The fourth proportional to 5.61, 8.42 and 2.61 is: 3.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.61 : 8.42 = 2.61 : x
  2. Step 2: Convert to fraction form
    5.61/8.42 = 2.61/x
  3. Step 3: Cross multiply
    5.61x = 8.42 × 2.61
  4. Step 4: Simplify right side
    5.61x = 21.96
  5. Step 5: Solve for x
    x = 21.96/5.61
  6. Step 6: Final answer
    x = 3.92

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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.