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Finding the Fourth Proportional to 720,855.72, 994,738.32 and 398,540.52

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Solution

The fourth proportional to 720,855.72, 994,738.32 and 398,540.52 is: 549,962.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,855.72 : 994,738.32 = 398,540.52 : x
  2. Step 2: Convert to fraction form
    720,855.72/994,738.32 = 398,540.52/x
  3. Step 3: Cross multiply
    720,855.72x = 994,738.32 × 398,540.52
  4. Step 4: Simplify right side
    720,855.72x = 396,443,527,316.73
  5. Step 5: Solve for x
    x = 396,443,527,316.73/720,855.72
  6. Step 6: Final answer
    x = 549,962.38

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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.