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Finding the Fourth Proportional to 720,786.32, 994,705.88 and 398,517.22

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Solution

The fourth proportional to 720,786.32, 994,705.88 and 398,517.22 is: 549,965.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,786.32 : 994,705.88 = 398,517.22 : x
  2. Step 2: Convert to fraction form
    720,786.32/994,705.88 = 398,517.22/x
  3. Step 3: Cross multiply
    720,786.32x = 994,705.88 × 398,517.22
  4. Step 4: Simplify right side
    720,786.32x = 396,407,422,015.25
  5. Step 5: Solve for x
    x = 396,407,422,015.25/720,786.32
  6. Step 6: Final answer
    x = 549,965.24

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.