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Finding the Fourth Proportional to 817,857, 1,128,630.51 and 455,280.21

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Solution

The fourth proportional to 817,857, 1,128,630.51 and 455,280.21 is: 628,279.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    817,857 : 1,128,630.51 = 455,280.21 : x
  2. Step 2: Convert to fraction form
    817,857/1,128,630.51 = 455,280.21/x
  3. Step 3: Cross multiply
    817,857x = 1,128,630.51 × 455,280.21
  4. Step 4: Simplify right side
    817,857x = 513,843,135,605.21
  5. Step 5: Solve for x
    x = 513,843,135,605.21/817,857
  6. Step 6: Final answer
    x = 628,279.93

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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.