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Finding the Fourth Proportional to 509,660.80, 764,491.20 and 257,718.40

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Solution

The fourth proportional to 509,660.80, 764,491.20 and 257,718.40 is: 386,577.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    509,660.80 : 764,491.20 = 257,718.40 : x
  2. Step 2: Convert to fraction form
    509,660.80/764,491.20 = 257,718.40/x
  3. Step 3: Cross multiply
    509,660.80x = 764,491.20 × 257,718.40
  4. Step 4: Simplify right side
    509,660.80x = 197,023,448,878.08
  5. Step 5: Solve for x
    x = 197,023,448,878.08/509,660.80
  6. Step 6: Final answer
    x = 386,577.60

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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.