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Finding the Fourth Proportional to 515,511.40, 711,387.04 and 286,078.71

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Solution

The fourth proportional to 515,511.40, 711,387.04 and 286,078.71 is: 394,778.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,511.40 : 711,387.04 = 286,078.71 : x
  2. Step 2: Convert to fraction form
    515,511.40/711,387.04 = 286,078.71/x
  3. Step 3: Cross multiply
    515,511.40x = 711,387.04 × 286,078.71
  4. Step 4: Simplify right side
    515,511.40x = 203,512,686,713.92
  5. Step 5: Solve for x
    x = 203,512,686,713.92/515,511.40
  6. Step 6: Final answer
    x = 394,778.25

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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.