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Finding the Fourth Proportional to 640,778.88, 884,303.04 and 399,204.48

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Solution

The fourth proportional to 640,778.88, 884,303.04 and 399,204.48 is: 550,919.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,778.88 : 884,303.04 = 399,204.48 : x
  2. Step 2: Convert to fraction form
    640,778.88/884,303.04 = 399,204.48/x
  3. Step 3: Cross multiply
    640,778.88x = 884,303.04 × 399,204.48
  4. Step 4: Simplify right side
    640,778.88x = 353,017,735,245.62
  5. Step 5: Solve for x
    x = 353,017,735,245.62/640,778.88
  6. Step 6: Final answer
    x = 550,919.74

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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.