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Finding the Fourth Proportional to 639,977.52, 959,643.60 and 213,361.92

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Solution

The fourth proportional to 639,977.52, 959,643.60 and 213,361.92 is: 319,935.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,977.52 : 959,643.60 = 213,361.92 : x
  2. Step 2: Convert to fraction form
    639,977.52/959,643.60 = 213,361.92/x
  3. Step 3: Cross multiply
    639,977.52x = 959,643.60 × 213,361.92
  4. Step 4: Simplify right side
    639,977.52x = 204,751,401,011.71
  5. Step 5: Solve for x
    x = 204,751,401,011.71/639,977.52
  6. Step 6: Final answer
    x = 319,935.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.