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Finding the Fourth Proportional to 641,712.87, 885,570.31 and 355,226.80

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Solution

The fourth proportional to 641,712.87, 885,570.31 and 355,226.80 is: 490,216.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,712.87 : 885,570.31 = 355,226.80 : x
  2. Step 2: Convert to fraction form
    641,712.87/885,570.31 = 355,226.80/x
  3. Step 3: Cross multiply
    641,712.87x = 885,570.31 × 355,226.80
  4. Step 4: Simplify right side
    641,712.87x = 314,578,307,396.31
  5. Step 5: Solve for x
    x = 314,578,307,396.31/641,712.87
  6. Step 6: Final answer
    x = 490,216.61

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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.