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Finding the Fourth Proportional to 398,640.78, 550,128.60 and 217,351.26

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Solution

The fourth proportional to 398,640.78, 550,128.60 and 217,351.26 is: 299,947.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,640.78 : 550,128.60 = 217,351.26 : x
  2. Step 2: Convert to fraction form
    398,640.78/550,128.60 = 217,351.26/x
  3. Step 3: Cross multiply
    398,640.78x = 550,128.60 × 217,351.26
  4. Step 4: Simplify right side
    398,640.78x = 119,571,144,372.04
  5. Step 5: Solve for x
    x = 119,571,144,372.04/398,640.78
  6. Step 6: Final answer
    x = 299,947.10

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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.