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Finding the Fourth Proportional to 394,499.52, 544,399.20 and 215,640

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Solution

The fourth proportional to 394,499.52, 544,399.20 and 215,640 is: 297,577.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,499.52 : 544,399.20 = 215,640 : x
  2. Step 2: Convert to fraction form
    394,499.52/544,399.20 = 215,640/x
  3. Step 3: Cross multiply
    394,499.52x = 544,399.20 × 215,640
  4. Step 4: Simplify right side
    394,499.52x = 117,394,243,488.00
  5. Step 5: Solve for x
    x = 117,394,243,488.00/394,499.52
  6. Step 6: Final answer
    x = 297,577.66

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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.