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Finding the Fourth Proportional to 720,786.57, 994,706.23 and 398,517.47

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Solution

The fourth proportional to 720,786.57, 994,706.23 and 398,517.47 is: 549,965.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,786.57 : 994,706.23 = 398,517.47 : x
  2. Step 2: Convert to fraction form
    720,786.57/994,706.23 = 398,517.47/x
  3. Step 3: Cross multiply
    720,786.57x = 994,706.23 × 398,517.47
  4. Step 4: Simplify right side
    720,786.57x = 396,407,810,172.84
  5. Step 5: Solve for x
    x = 396,407,810,172.84/720,786.57
  6. Step 6: Final answer
    x = 549,965.59

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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.