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Finding the Fourth Proportional to 149,428.92, 206,210.60 and 81,445.90

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Solution

The fourth proportional to 149,428.92, 206,210.60 and 81,445.90 is: 112,394.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    149,428.92 : 206,210.60 = 81,445.90 : x
  2. Step 2: Convert to fraction form
    149,428.92/206,210.60 = 81,445.90/x
  3. Step 3: Cross multiply
    149,428.92x = 206,210.60 × 81,445.90
  4. Step 4: Simplify right side
    149,428.92x = 16,795,007,906.54
  5. Step 5: Solve for x
    x = 16,795,007,906.54/149,428.92
  6. Step 6: Final answer
    x = 112,394.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.