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Finding the Fourth Proportional to 280,813.92, 387,523.41 and 153,489.51

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Solution

The fourth proportional to 280,813.92, 387,523.41 and 153,489.51 is: 211,815.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,813.92 : 387,523.41 = 153,489.51 : x
  2. Step 2: Convert to fraction form
    280,813.92/387,523.41 = 153,489.51/x
  3. Step 3: Cross multiply
    280,813.92x = 387,523.41 × 153,489.51
  4. Step 4: Simplify right side
    280,813.92x = 59,480,778,314.43
  5. Step 5: Solve for x
    x = 59,480,778,314.43/280,813.92
  6. Step 6: Final answer
    x = 211,815.63

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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.