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Finding the Fourth Proportional to 99,990.70, 149,986.05 and 84,244.30

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Solution

The fourth proportional to 99,990.70, 149,986.05 and 84,244.30 is: 126,366.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,990.70 : 149,986.05 = 84,244.30 : x
  2. Step 2: Convert to fraction form
    99,990.70/149,986.05 = 84,244.30/x
  3. Step 3: Cross multiply
    99,990.70x = 149,986.05 × 84,244.30
  4. Step 4: Simplify right side
    99,990.70x = 12,635,469,792.02
  5. Step 5: Solve for x
    x = 12,635,469,792.02/99,990.70
  6. Step 6: Final answer
    x = 126,366.45

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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.