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Finding the Fourth Proportional to 70.90, 106.44 and 43.90

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Solution

The fourth proportional to 70.90, 106.44 and 43.90 is: 65.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.90 : 106.44 = 43.90 : x
  2. Step 2: Convert to fraction form
    70.90/106.44 = 43.90/x
  3. Step 3: Cross multiply
    70.90x = 106.44 × 43.90
  4. Step 4: Simplify right side
    70.90x = 4,672.72
  5. Step 5: Solve for x
    x = 4,672.72/70.90
  6. Step 6: Final answer
    x = 65.91

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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.