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Finding the Fourth Proportional to 257,653.92, 386,439.30 and 70,621.68

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Solution

The fourth proportional to 257,653.92, 386,439.30 and 70,621.68 is: 105,921.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,653.92 : 386,439.30 = 70,621.68 : x
  2. Step 2: Convert to fraction form
    257,653.92/386,439.30 = 70,621.68/x
  3. Step 3: Cross multiply
    257,653.92x = 386,439.30 × 70,621.68
  4. Step 4: Simplify right side
    257,653.92x = 27,290,992,584.02
  5. Step 5: Solve for x
    x = 27,290,992,584.02/257,653.92
  6. Step 6: Final answer
    x = 105,921.12

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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.