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Finding the Fourth Proportional to 39,678.97, 59,489.25 and 18,917.05

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Solution

The fourth proportional to 39,678.97, 59,489.25 and 18,917.05 is: 28,361.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,678.97 : 59,489.25 = 18,917.05 : x
  2. Step 2: Convert to fraction form
    39,678.97/59,489.25 = 18,917.05/x
  3. Step 3: Cross multiply
    39,678.97x = 59,489.25 × 18,917.05
  4. Step 4: Simplify right side
    39,678.97x = 1,125,361,116.71
  5. Step 5: Solve for x
    x = 1,125,361,116.71/39,678.97
  6. Step 6: Final answer
    x = 28,361.65

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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.