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Finding the Fourth Proportional to 99,532.80, 137,203.20 and 86,169.60

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Solution

The fourth proportional to 99,532.80, 137,203.20 and 86,169.60 is: 118,782.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,532.80 : 137,203.20 = 86,169.60 : x
  2. Step 2: Convert to fraction form
    99,532.80/137,203.20 = 86,169.60/x
  3. Step 3: Cross multiply
    99,532.80x = 137,203.20 × 86,169.60
  4. Step 4: Simplify right side
    99,532.80x = 11,822,744,862.72
  5. Step 5: Solve for x
    x = 11,822,744,862.72/99,532.80
  6. Step 6: Final answer
    x = 118,782.40

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1.5x scale

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.