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Finding the Fourth Proportional to 720,786.07, 994,705.54 and 398,516.97

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Solution

The fourth proportional to 720,786.07, 994,705.54 and 398,516.97 is: 549,964.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,786.07 : 994,705.54 = 398,516.97 : x
  2. Step 2: Convert to fraction form
    720,786.07/994,705.54 = 398,516.97/x
  3. Step 3: Cross multiply
    720,786.07x = 994,705.54 × 398,516.97
  4. Step 4: Simplify right side
    720,786.07x = 396,407,037,843.01
  5. Step 5: Solve for x
    x = 396,407,037,843.01/720,786.07
  6. Step 6: Final answer
    x = 549,964.90

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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.