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Finding the Fourth Proportional to 640,941.60, 961,120.80 and 285,772.80

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Solution

The fourth proportional to 640,941.60, 961,120.80 and 285,772.80 is: 428,529.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,941.60 : 961,120.80 = 285,772.80 : x
  2. Step 2: Convert to fraction form
    640,941.60/961,120.80 = 285,772.80/x
  3. Step 3: Cross multiply
    640,941.60x = 961,120.80 × 285,772.80
  4. Step 4: Simplify right side
    640,941.60x = 274,662,182,154.24
  5. Step 5: Solve for x
    x = 274,662,182,154.24/640,941.60
  6. Step 6: Final answer
    x = 428,529.19

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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.