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Finding the Fourth Proportional to 720,845.72, 994,726.90 and 398,537

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Solution

The fourth proportional to 720,845.72, 994,726.90 and 398,537 is: 549,958.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,845.72 : 994,726.90 = 398,537 : x
  2. Step 2: Convert to fraction form
    720,845.72/994,726.90 = 398,537/x
  3. Step 3: Cross multiply
    720,845.72x = 994,726.90 × 398,537
  4. Step 4: Simplify right side
    720,845.72x = 396,435,474,545.30
  5. Step 5: Solve for x
    x = 396,435,474,545.30/720,845.72
  6. Step 6: Final answer
    x = 549,958.84

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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.