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Finding the Fourth Proportional to 639,046.47, 957,840.82 and 399,270.63

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Solution

The fourth proportional to 639,046.47, 957,840.82 and 399,270.63 is: 598,450.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,046.47 : 957,840.82 = 399,270.63 : x
  2. Step 2: Convert to fraction form
    639,046.47/957,840.82 = 399,270.63/x
  3. Step 3: Cross multiply
    639,046.47x = 957,840.82 × 399,270.63
  4. Step 4: Simplify right side
    639,046.47x = 382,437,707,641.12
  5. Step 5: Solve for x
    x = 382,437,707,641.12/639,046.47
  6. Step 6: Final answer
    x = 598,450.54

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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.