Home / 809,407.80-1,214,111.70-388,582.20

Finding the Fourth Proportional to 809,407.80, 1,214,111.70 and 388,582.20

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Solution

The fourth proportional to 809,407.80, 1,214,111.70 and 388,582.20 is: 582,873.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    809,407.80 : 1,214,111.70 = 388,582.20 : x
  2. Step 2: Convert to fraction form
    809,407.80/1,214,111.70 = 388,582.20/x
  3. Step 3: Cross multiply
    809,407.80x = 1,214,111.70 × 388,582.20
  4. Step 4: Simplify right side
    809,407.80x = 471,782,195,431.74
  5. Step 5: Solve for x
    x = 471,782,195,431.74/809,407.80
  6. Step 6: Final answer
    x = 582,873.30

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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.