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Finding the Fourth Proportional to 261,143.87, 391,689.68 and 83,603.21

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Solution

The fourth proportional to 261,143.87, 391,689.68 and 83,603.21 is: 125,396.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,143.87 : 391,689.68 = 83,603.21 : x
  2. Step 2: Convert to fraction form
    261,143.87/391,689.68 = 83,603.21/x
  3. Step 3: Cross multiply
    261,143.87x = 391,689.68 × 83,603.21
  4. Step 4: Simplify right side
    261,143.87x = 32,746,512,195.41
  5. Step 5: Solve for x
    x = 32,746,512,195.41/261,143.87
  6. Step 6: Final answer
    x = 125,396.44

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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.