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Finding the Fourth Proportional to 621,813.60, 932,720.40 and 432,856.80

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Solution

The fourth proportional to 621,813.60, 932,720.40 and 432,856.80 is: 649,285.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,813.60 : 932,720.40 = 432,856.80 : x
  2. Step 2: Convert to fraction form
    621,813.60/932,720.40 = 432,856.80/x
  3. Step 3: Cross multiply
    621,813.60x = 932,720.40 × 432,856.80
  4. Step 4: Simplify right side
    621,813.60x = 403,734,367,638.72
  5. Step 5: Solve for x
    x = 403,734,367,638.72/621,813.60
  6. Step 6: Final answer
    x = 649,285.20

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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.