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Finding the Fourth Proportional to 191,920.40, 287,794.20 and 86,685.20

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Solution

The fourth proportional to 191,920.40, 287,794.20 and 86,685.20 is: 129,988.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,920.40 : 287,794.20 = 86,685.20 : x
  2. Step 2: Convert to fraction form
    191,920.40/287,794.20 = 86,685.20/x
  3. Step 3: Cross multiply
    191,920.40x = 287,794.20 × 86,685.20
  4. Step 4: Simplify right side
    191,920.40x = 24,947,497,785.84
  5. Step 5: Solve for x
    x = 24,947,497,785.84/191,920.40
  6. Step 6: Final answer
    x = 129,988.78

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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.