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Finding the Fourth Proportional to 639,124.39, 957,958.17 and 399,349

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Solution

The fourth proportional to 639,124.39, 957,958.17 and 399,349 is: 598,568.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,124.39 : 957,958.17 = 399,349 : x
  2. Step 2: Convert to fraction form
    639,124.39/957,958.17 = 399,349/x
  3. Step 3: Cross multiply
    639,124.39x = 957,958.17 × 399,349
  4. Step 4: Simplify right side
    639,124.39x = 382,559,637,231.33
  5. Step 5: Solve for x
    x = 382,559,637,231.33/639,124.39
  6. Step 6: Final answer
    x = 598,568.36

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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.