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Finding the Fourth Proportional to 640,876.28, 884,415.21 and 354,401.15

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Solution

The fourth proportional to 640,876.28, 884,415.21 and 354,401.15 is: 489,076.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,876.28 : 884,415.21 = 354,401.15 : x
  2. Step 2: Convert to fraction form
    640,876.28/884,415.21 = 354,401.15/x
  3. Step 3: Cross multiply
    640,876.28x = 884,415.21 × 354,401.15
  4. Step 4: Simplify right side
    640,876.28x = 313,437,764,237.83
  5. Step 5: Solve for x
    x = 313,437,764,237.83/640,876.28
  6. Step 6: Final answer
    x = 489,076.87

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1.5x scale

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.