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Finding the Fourth Proportional to 115,390.80, 173,086.20 and 99,838.80

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Solution

The fourth proportional to 115,390.80, 173,086.20 and 99,838.80 is: 149,758.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,390.80 : 173,086.20 = 99,838.80 : x
  2. Step 2: Convert to fraction form
    115,390.80/173,086.20 = 99,838.80/x
  3. Step 3: Cross multiply
    115,390.80x = 173,086.20 × 99,838.80
  4. Step 4: Simplify right side
    115,390.80x = 17,280,718,504.56
  5. Step 5: Solve for x
    x = 17,280,718,504.56/115,390.80
  6. Step 6: Final answer
    x = 149,758.20

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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.