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Finding the Fourth Proportional to 639,718.60, 959,117.10 and 359,321.80

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Solution

The fourth proportional to 639,718.60, 959,117.10 and 359,321.80 is: 538,723.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,718.60 : 959,117.10 = 359,321.80 : x
  2. Step 2: Convert to fraction form
    639,718.60/959,117.10 = 359,321.80/x
  3. Step 3: Cross multiply
    639,718.60x = 959,117.10 × 359,321.80
  4. Step 4: Simplify right side
    639,718.60x = 344,631,682,782.78
  5. Step 5: Solve for x
    x = 344,631,682,782.78/639,718.60
  6. Step 6: Final answer
    x = 538,723.87

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.