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Finding the Fourth Proportional to 720,745.92, 994,658.40 and 398,456.64

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Solution

The fourth proportional to 720,745.92, 994,658.40 and 398,456.64 is: 549,886.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,745.92 : 994,658.40 = 398,456.64 : x
  2. Step 2: Convert to fraction form
    720,745.92/994,658.40 = 398,456.64/x
  3. Step 3: Cross multiply
    720,745.92x = 994,658.40 × 398,456.64
  4. Step 4: Simplify right side
    720,745.92x = 396,328,244,011.78
  5. Step 5: Solve for x
    x = 396,328,244,011.78/720,745.92
  6. Step 6: Final answer
    x = 549,886.21

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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.