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Finding the Fourth Proportional to 642,723.20, 965,121.60 and 485,129.60

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Solution

The fourth proportional to 642,723.20, 965,121.60 and 485,129.60 is: 728,476.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,723.20 : 965,121.60 = 485,129.60 : x
  2. Step 2: Convert to fraction form
    642,723.20/965,121.60 = 485,129.60/x
  3. Step 3: Cross multiply
    642,723.20x = 965,121.60 × 485,129.60
  4. Step 4: Simplify right side
    642,723.20x = 468,209,055,759.36
  5. Step 5: Solve for x
    x = 468,209,055,759.36/642,723.20
  6. Step 6: Final answer
    x = 728,476.98

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1.5x scale

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.