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Finding the Fourth Proportional to 720,618.45, 994,435.97 and 398,320.26

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Solution

The fourth proportional to 720,618.45, 994,435.97 and 398,320.26 is: 549,672.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,618.45 : 994,435.97 = 398,320.26 : x
  2. Step 2: Convert to fraction form
    720,618.45/994,435.97 = 398,320.26/x
  3. Step 3: Cross multiply
    720,618.45x = 994,435.97 × 398,320.26
  4. Step 4: Simplify right side
    720,618.45x = 396,103,992,132.15
  5. Step 5: Solve for x
    x = 396,103,992,132.15/720,618.45
  6. Step 6: Final answer
    x = 549,672.29

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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.