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Finding the Fourth Proportional to 720,740.20, 994,623.78 and 398,468.20

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Solution

The fourth proportional to 720,740.20, 994,623.78 and 398,468.20 is: 549,887.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,740.20 : 994,623.78 = 398,468.20 : x
  2. Step 2: Convert to fraction form
    720,740.20/994,623.78 = 398,468.20/x
  3. Step 3: Cross multiply
    720,740.20x = 994,623.78 × 398,468.20
  4. Step 4: Simplify right side
    720,740.20x = 396,325,947,293.80
  5. Step 5: Solve for x
    x = 396,325,947,293.80/720,740.20
  6. Step 6: Final answer
    x = 549,887.39

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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.