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Finding the Fourth Proportional to 639,662, 882,811.32 and 371,390

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Solution

The fourth proportional to 639,662, 882,811.32 and 371,390 is: 512,563.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,662 : 882,811.32 = 371,390 : x
  2. Step 2: Convert to fraction form
    639,662/882,811.32 = 371,390/x
  3. Step 3: Cross multiply
    639,662x = 882,811.32 × 371,390
  4. Step 4: Simplify right side
    639,662x = 327,867,296,134.80
  5. Step 5: Solve for x
    x = 327,867,296,134.80/639,662
  6. Step 6: Final answer
    x = 512,563.35

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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.