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Finding the Fourth Proportional to 639,123.39, 957,956.67 and 399,348

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Solution

The fourth proportional to 639,123.39, 957,956.67 and 399,348 is: 598,566.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,123.39 : 957,956.67 = 399,348 : x
  2. Step 2: Convert to fraction form
    639,123.39/957,956.67 = 399,348/x
  3. Step 3: Cross multiply
    639,123.39x = 957,956.67 × 399,348
  4. Step 4: Simplify right side
    639,123.39x = 382,558,080,251.16
  5. Step 5: Solve for x
    x = 382,558,080,251.16/639,123.39
  6. Step 6: Final answer
    x = 598,566.86

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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.