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Finding the Fourth Proportional to 64,600.80, 89,151.20 and 39,111.84

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Solution

The fourth proportional to 64,600.80, 89,151.20 and 39,111.84 is: 53,975.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,600.80 : 89,151.20 = 39,111.84 : x
  2. Step 2: Convert to fraction form
    64,600.80/89,151.20 = 39,111.84/x
  3. Step 3: Cross multiply
    64,600.80x = 89,151.20 × 39,111.84
  4. Step 4: Simplify right side
    64,600.80x = 3,486,867,470.21
  5. Step 5: Solve for x
    x = 3,486,867,470.21/64,600.80
  6. Step 6: Final answer
    x = 53,975.61

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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.