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Finding the Fourth Proportional to 639,453.11, 958,900.61 and 339,861.65

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Solution

The fourth proportional to 639,453.11, 958,900.61 and 339,861.65 is: 509,644.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,453.11 : 958,900.61 = 339,861.65 : x
  2. Step 2: Convert to fraction form
    639,453.11/958,900.61 = 339,861.65/x
  3. Step 3: Cross multiply
    639,453.11x = 958,900.61 × 339,861.65
  4. Step 4: Simplify right side
    639,453.11x = 325,893,539,555.76
  5. Step 5: Solve for x
    x = 325,893,539,555.76/639,453.11
  6. Step 6: Final answer
    x = 509,644.16

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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.