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Finding the Fourth Proportional to 398,642.78, 550,131.36 and 217,353.26

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Solution

The fourth proportional to 398,642.78, 550,131.36 and 217,353.26 is: 299,949.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,642.78 : 550,131.36 = 217,353.26 : x
  2. Step 2: Convert to fraction form
    398,642.78/550,131.36 = 217,353.26/x
  3. Step 3: Cross multiply
    398,642.78x = 550,131.36 × 217,353.26
  4. Step 4: Simplify right side
    398,642.78x = 119,572,844,524.23
  5. Step 5: Solve for x
    x = 119,572,844,524.23/398,642.78
  6. Step 6: Final answer
    x = 299,949.86

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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.