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Finding the Fourth Proportional to 257,411.85, 386,117.78 and 79,936.80

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Solution

The fourth proportional to 257,411.85, 386,117.78 and 79,936.80 is: 119,905.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,411.85 : 386,117.78 = 79,936.80 : x
  2. Step 2: Convert to fraction form
    257,411.85/386,117.78 = 79,936.80/x
  3. Step 3: Cross multiply
    257,411.85x = 386,117.78 × 79,936.80
  4. Step 4: Simplify right side
    257,411.85x = 30,865,019,356.62
  5. Step 5: Solve for x
    x = 30,865,019,356.62/257,411.85
  6. Step 6: Final answer
    x = 119,905.20

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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.