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Finding the Fourth Proportional to 393,974.40, 547,354.92 and 389,250.48

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Solution

The fourth proportional to 393,974.40, 547,354.92 and 389,250.48 is: 540,791.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,974.40 : 547,354.92 = 389,250.48 : x
  2. Step 2: Convert to fraction form
    393,974.40/547,354.92 = 389,250.48/x
  3. Step 3: Cross multiply
    393,974.40x = 547,354.92 × 389,250.48
  4. Step 4: Simplify right side
    393,974.40x = 213,058,165,340.36
  5. Step 5: Solve for x
    x = 213,058,165,340.36/393,974.40
  6. Step 6: Final answer
    x = 540,791.90

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1.5x scale

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.