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Finding the Fourth Proportional to 521,128.35, 717,664.77 and 447,940.40

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Solution

The fourth proportional to 521,128.35, 717,664.77 and 447,940.40 is: 616,874.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,128.35 : 717,664.77 = 447,940.40 : x
  2. Step 2: Convert to fraction form
    521,128.35/717,664.77 = 447,940.40/x
  3. Step 3: Cross multiply
    521,128.35x = 717,664.77 × 447,940.40
  4. Step 4: Simplify right side
    521,128.35x = 321,471,040,551.38
  5. Step 5: Solve for x
    x = 321,471,040,551.38/521,128.35
  6. Step 6: Final answer
    x = 616,874.98

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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.