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Finding the Fourth Proportional to 99,661.80, 149,492.70 and 81,947.10

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Solution

The fourth proportional to 99,661.80, 149,492.70 and 81,947.10 is: 122,920.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,661.80 : 149,492.70 = 81,947.10 : x
  2. Step 2: Convert to fraction form
    99,661.80/149,492.70 = 81,947.10/x
  3. Step 3: Cross multiply
    99,661.80x = 149,492.70 × 81,947.10
  4. Step 4: Simplify right side
    99,661.80x = 12,250,493,236.17
  5. Step 5: Solve for x
    x = 12,250,493,236.17/99,661.80
  6. Step 6: Final answer
    x = 122,920.65

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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.