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Finding the Fourth Proportional to 398,912.11, 552,827.63 and 391,342.39

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Solution

The fourth proportional to 398,912.11, 552,827.63 and 391,342.39 is: 542,337.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,912.11 : 552,827.63 = 391,342.39 : x
  2. Step 2: Convert to fraction form
    398,912.11/552,827.63 = 391,342.39/x
  3. Step 3: Cross multiply
    398,912.11x = 552,827.63 × 391,342.39
  4. Step 4: Simplify right side
    398,912.11x = 216,344,885,578.52
  5. Step 5: Solve for x
    x = 216,344,885,578.52/398,912.11
  6. Step 6: Final answer
    x = 542,337.23

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.