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Finding the Fourth Proportional to 718,700.87, 991,803.16 and 396,410.19

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Solution

The fourth proportional to 718,700.87, 991,803.16 and 396,410.19 is: 547,043.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,700.87 : 991,803.16 = 396,410.19 : x
  2. Step 2: Convert to fraction form
    718,700.87/991,803.16 = 396,410.19/x
  3. Step 3: Cross multiply
    718,700.87x = 991,803.16 × 396,410.19
  4. Step 4: Simplify right side
    718,700.87x = 393,160,879,098.20
  5. Step 5: Solve for x
    x = 393,160,879,098.20/718,700.87
  6. Step 6: Final answer
    x = 547,043.83

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Double scale
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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.