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Finding the Fourth Proportional to 70.61, 105.86 and 43.55

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Solution

The fourth proportional to 70.61, 105.86 and 43.55 is: 65.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.61 : 105.86 = 43.55 : x
  2. Step 2: Convert to fraction form
    70.61/105.86 = 43.55/x
  3. Step 3: Cross multiply
    70.61x = 105.86 × 43.55
  4. Step 4: Simplify right side
    70.61x = 4,609.46
  5. Step 5: Solve for x
    x = 4,609.46/70.61
  6. Step 6: Final answer
    x = 65.29

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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.