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Finding the Fourth Proportional to 69.71, 104.43 and 45.30

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Solution

The fourth proportional to 69.71, 104.43 and 45.30 is: 67.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.71 : 104.43 = 45.30 : x
  2. Step 2: Convert to fraction form
    69.71/104.43 = 45.30/x
  3. Step 3: Cross multiply
    69.71x = 104.43 × 45.30
  4. Step 4: Simplify right side
    69.71x = 4,730.68
  5. Step 5: Solve for x
    x = 4,730.68/69.71
  6. Step 6: Final answer
    x = 67.86

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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.