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Finding the Fourth Proportional to 639,685.88, 959,533.28 and 439,399.21

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Solution

The fourth proportional to 639,685.88, 959,533.28 and 439,399.21 is: 659,101.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,685.88 : 959,533.28 = 439,399.21 : x
  2. Step 2: Convert to fraction form
    639,685.88/959,533.28 = 439,399.21/x
  3. Step 3: Cross multiply
    639,685.88x = 959,533.28 × 439,399.21
  4. Step 4: Simplify right side
    639,685.88x = 421,618,165,200.71
  5. Step 5: Solve for x
    x = 421,618,165,200.71/639,685.88
  6. Step 6: Final answer
    x = 659,101.88

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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.