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Finding the Fourth Proportional to 389,667.40, 538,112.39 and 368,438.61

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Solution

The fourth proportional to 389,667.40, 538,112.39 and 368,438.61 is: 508,796.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,667.40 : 538,112.39 = 368,438.61 : x
  2. Step 2: Convert to fraction form
    389,667.40/538,112.39 = 368,438.61/x
  3. Step 3: Cross multiply
    389,667.40x = 538,112.39 × 368,438.61
  4. Step 4: Simplify right side
    389,667.40x = 198,261,380,995.38
  5. Step 5: Solve for x
    x = 198,261,380,995.38/389,667.40
  6. Step 6: Final answer
    x = 508,796.43

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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.