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Finding the Fourth Proportional to 640,801.60, 961,288.80 and 220,206.40

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Solution

The fourth proportional to 640,801.60, 961,288.80 and 220,206.40 is: 330,339.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,801.60 : 961,288.80 = 220,206.40 : x
  2. Step 2: Convert to fraction form
    640,801.60/961,288.80 = 220,206.40/x
  3. Step 3: Cross multiply
    640,801.60x = 961,288.80 × 220,206.40
  4. Step 4: Simplify right side
    640,801.60x = 211,681,946,008.32
  5. Step 5: Solve for x
    x = 211,681,946,008.32/640,801.60
  6. Step 6: Final answer
    x = 330,339.29

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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.