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Finding the Fourth Proportional to 99,685, 149,335.62 and 78,513.04

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Solution

The fourth proportional to 99,685, 149,335.62 and 78,513.04 is: 117,618.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,685 : 149,335.62 = 78,513.04 : x
  2. Step 2: Convert to fraction form
    99,685/149,335.62 = 78,513.04/x
  3. Step 3: Cross multiply
    99,685x = 149,335.62 × 78,513.04
  4. Step 4: Simplify right side
    99,685x = 11,724,793,506.48
  5. Step 5: Solve for x
    x = 11,724,793,506.48/99,685
  6. Step 6: Final answer
    x = 117,618.43

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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.