Home / 642,738.20-965,144.10-485,144.60

Finding the Fourth Proportional to 642,738.20, 965,144.10 and 485,144.60

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Solution

The fourth proportional to 642,738.20, 965,144.10 and 485,144.60 is: 728,499.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,738.20 : 965,144.10 = 485,144.60 : x
  2. Step 2: Convert to fraction form
    642,738.20/965,144.10 = 485,144.60/x
  3. Step 3: Cross multiply
    642,738.20x = 965,144.10 × 485,144.60
  4. Step 4: Simplify right side
    642,738.20x = 468,234,448,336.86
  5. Step 5: Solve for x
    x = 468,234,448,336.86/642,738.20
  6. Step 6: Final answer
    x = 728,499.49

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Half scale
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Double scale
Find fourth proportional to 642,739.20, 965,145.60 and 485,145.60
Similar ratio
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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.