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Finding the Fourth Proportional to 139,893.28, 209,880.92 and 45,121.56

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Solution

The fourth proportional to 139,893.28, 209,880.92 and 45,121.56 is: 67,695.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,893.28 : 209,880.92 = 45,121.56 : x
  2. Step 2: Convert to fraction form
    139,893.28/209,880.92 = 45,121.56/x
  3. Step 3: Cross multiply
    139,893.28x = 209,880.92 × 45,121.56
  4. Step 4: Simplify right side
    139,893.28x = 9,470,153,850.39
  5. Step 5: Solve for x
    x = 9,470,153,850.39/139,893.28
  6. Step 6: Final answer
    x = 67,695.56

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1.5x scale

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.