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Finding the Fourth Proportional to 640,859.76, 884,392.20 and 354,399.12

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Solution

The fourth proportional to 640,859.76, 884,392.20 and 354,399.12 is: 489,073.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,859.76 : 884,392.20 = 354,399.12 : x
  2. Step 2: Convert to fraction form
    640,859.76/884,392.20 = 354,399.12/x
  3. Step 3: Cross multiply
    640,859.76x = 884,392.20 × 354,399.12
  4. Step 4: Simplify right side
    640,859.76x = 313,427,817,414.86
  5. Step 5: Solve for x
    x = 313,427,817,414.86/640,859.76
  6. Step 6: Final answer
    x = 489,073.95

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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.