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Finding the Fourth Proportional to 640,785.60, 961,264.80 and 220,190.40

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Solution

The fourth proportional to 640,785.60, 961,264.80 and 220,190.40 is: 330,315.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,785.60 : 961,264.80 = 220,190.40 : x
  2. Step 2: Convert to fraction form
    640,785.60/961,264.80 = 220,190.40/x
  3. Step 3: Cross multiply
    640,785.60x = 961,264.80 × 220,190.40
  4. Step 4: Simplify right side
    640,785.60x = 211,661,280,817.92
  5. Step 5: Solve for x
    x = 211,661,280,817.92/640,785.60
  6. Step 6: Final answer
    x = 330,315.29

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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.