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Finding the Fourth Proportional to 513,911.40, 770,867.10 and 139,934.40

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Solution

The fourth proportional to 513,911.40, 770,867.10 and 139,934.40 is: 209,901.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    513,911.40 : 770,867.10 = 139,934.40 : x
  2. Step 2: Convert to fraction form
    513,911.40/770,867.10 = 139,934.40/x
  3. Step 3: Cross multiply
    513,911.40x = 770,867.10 × 139,934.40
  4. Step 4: Simplify right side
    513,911.40x = 107,870,825,118.24
  5. Step 5: Solve for x
    x = 107,870,825,118.24/513,911.40
  6. Step 6: Final answer
    x = 209,901.60

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Double scale
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Similar ratio
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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.