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Finding the Fourth Proportional to 70.89, 106.43 and 43.86

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Solution

The fourth proportional to 70.89, 106.43 and 43.86 is: 65.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.89 : 106.43 = 43.86 : x
  2. Step 2: Convert to fraction form
    70.89/106.43 = 43.86/x
  3. Step 3: Cross multiply
    70.89x = 106.43 × 43.86
  4. Step 4: Simplify right side
    70.89x = 4,667.80
  5. Step 5: Solve for x
    x = 4,667.80/70.89
  6. Step 6: Final answer
    x = 65.85

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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.