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Finding the Fourth Proportional to 720,890.11, 994,788.15 and 398,580.85

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Solution

The fourth proportional to 720,890.11, 994,788.15 and 398,580.85 is: 550,019.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,890.11 : 994,788.15 = 398,580.85 : x
  2. Step 2: Convert to fraction form
    720,890.11/994,788.15 = 398,580.85/x
  3. Step 3: Cross multiply
    720,890.11x = 994,788.15 × 398,580.85
  4. Step 4: Simplify right side
    720,890.11x = 396,503,506,396.93
  5. Step 5: Solve for x
    x = 396,503,506,396.93/720,890.11
  6. Step 6: Final answer
    x = 550,019.35

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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.