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Finding the Fourth Proportional to 186,978.60, 280,565.10 and 81,808.20

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Solution

The fourth proportional to 186,978.60, 280,565.10 and 81,808.20 is: 122,754.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    186,978.60 : 280,565.10 = 81,808.20 : x
  2. Step 2: Convert to fraction form
    186,978.60/280,565.10 = 81,808.20/x
  3. Step 3: Cross multiply
    186,978.60x = 280,565.10 × 81,808.20
  4. Step 4: Simplify right side
    186,978.60x = 22,952,525,813.82
  5. Step 5: Solve for x
    x = 22,952,525,813.82/186,978.60
  6. Step 6: Final answer
    x = 122,754.83

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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.