Home / 990,400.80-1,485,601.20-517,231.20

Finding the Fourth Proportional to 990,400.80, 1,485,601.20 and 517,231.20

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Solution

The fourth proportional to 990,400.80, 1,485,601.20 and 517,231.20 is: 775,846.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    990,400.80 : 1,485,601.20 = 517,231.20 : x
  2. Step 2: Convert to fraction form
    990,400.80/1,485,601.20 = 517,231.20/x
  3. Step 3: Cross multiply
    990,400.80x = 1,485,601.20 × 517,231.20
  4. Step 4: Simplify right side
    990,400.80x = 768,399,291,397.44
  5. Step 5: Solve for x
    x = 768,399,291,397.44/990,400.80
  6. Step 6: Final answer
    x = 775,846.80

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Double scale
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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.