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Finding the Fourth Proportional to 641,891.78, 885,841.08 and 387,237.50

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Solution

The fourth proportional to 641,891.78, 885,841.08 and 387,237.50 is: 534,406.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,891.78 : 885,841.08 = 387,237.50 : x
  2. Step 2: Convert to fraction form
    641,891.78/885,841.08 = 387,237.50/x
  3. Step 3: Cross multiply
    641,891.78x = 885,841.08 × 387,237.50
  4. Step 4: Simplify right side
    641,891.78x = 343,030,885,216.50
  5. Step 5: Solve for x
    x = 343,030,885,216.50/641,891.78
  6. Step 6: Final answer
    x = 534,406.10

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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.