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Finding the Fourth Proportional to 67,640.70, 101,475.45 and 20,898.30

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Solution

The fourth proportional to 67,640.70, 101,475.45 and 20,898.30 is: 31,351.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,640.70 : 101,475.45 = 20,898.30 : x
  2. Step 2: Convert to fraction form
    67,640.70/101,475.45 = 20,898.30/x
  3. Step 3: Cross multiply
    67,640.70x = 101,475.45 × 20,898.30
  4. Step 4: Simplify right side
    67,640.70x = 2,120,664,396.74
  5. Step 5: Solve for x
    x = 2,120,664,396.74/67,640.70
  6. Step 6: Final answer
    x = 31,351.90

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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.