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Finding the Fourth Proportional to 99,660.80, 149,491.20 and 81,946.10

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Solution

The fourth proportional to 99,660.80, 149,491.20 and 81,946.10 is: 122,919.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,660.80 : 149,491.20 = 81,946.10 : x
  2. Step 2: Convert to fraction form
    99,660.80/149,491.20 = 81,946.10/x
  3. Step 3: Cross multiply
    99,660.80x = 149,491.20 × 81,946.10
  4. Step 4: Simplify right side
    99,660.80x = 12,250,220,824.32
  5. Step 5: Solve for x
    x = 12,250,220,824.32/99,660.80
  6. Step 6: Final answer
    x = 122,919.15

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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.