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Finding the Fourth Proportional to 70.12, 105.57 and 61.61

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Solution

The fourth proportional to 70.12, 105.57 and 61.61 is: 92.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.12 : 105.57 = 61.61 : x
  2. Step 2: Convert to fraction form
    70.12/105.57 = 61.61/x
  3. Step 3: Cross multiply
    70.12x = 105.57 × 61.61
  4. Step 4: Simplify right side
    70.12x = 6,504.20
  5. Step 5: Solve for x
    x = 6,504.20/70.12
  6. Step 6: Final answer
    x = 92.76

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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.