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Finding the Fourth Proportional to 639,683.88, 959,530.28 and 439,397.21

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Solution

The fourth proportional to 639,683.88, 959,530.28 and 439,397.21 is: 659,098.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,683.88 : 959,530.28 = 439,397.21 : x
  2. Step 2: Convert to fraction form
    639,683.88/959,530.28 = 439,397.21/x
  3. Step 3: Cross multiply
    639,683.88x = 959,530.28 × 439,397.21
  4. Step 4: Simplify right side
    639,683.88x = 421,614,920,947.88
  5. Step 5: Solve for x
    x = 421,614,920,947.88/639,683.88
  6. Step 6: Final answer
    x = 659,098.87

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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.