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Finding the Fourth Proportional to 640,321.78, 883,646.78 and 349,939.12

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Solution

The fourth proportional to 640,321.78, 883,646.78 and 349,939.12 is: 482,917.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,321.78 : 883,646.78 = 349,939.12 : x
  2. Step 2: Convert to fraction form
    640,321.78/883,646.78 = 349,939.12/x
  3. Step 3: Cross multiply
    640,321.78x = 883,646.78 × 349,939.12
  4. Step 4: Simplify right side
    640,321.78x = 309,222,576,584.03
  5. Step 5: Solve for x
    x = 309,222,576,584.03/640,321.78
  6. Step 6: Final answer
    x = 482,917.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.