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Finding the Fourth Proportional to 149,898.60, 206,856.54 and 81,912.60

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Solution

The fourth proportional to 149,898.60, 206,856.54 and 81,912.60 is: 113,037.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    149,898.60 : 206,856.54 = 81,912.60 : x
  2. Step 2: Convert to fraction form
    149,898.60/206,856.54 = 81,912.60/x
  3. Step 3: Cross multiply
    149,898.60x = 206,856.54 × 81,912.60
  4. Step 4: Simplify right side
    149,898.60x = 16,944,157,018.40
  5. Step 5: Solve for x
    x = 16,944,157,018.40/149,898.60
  6. Step 6: Final answer
    x = 113,037.46

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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.