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Finding the Fourth Proportional to 398,840.76, 550,401.96 and 217,556.64

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Solution

The fourth proportional to 398,840.76, 550,401.96 and 217,556.64 is: 300,229.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,840.76 : 550,401.96 = 217,556.64 : x
  2. Step 2: Convert to fraction form
    398,840.76/550,401.96 = 217,556.64/x
  3. Step 3: Cross multiply
    398,840.76x = 550,401.96 × 217,556.64
  4. Step 4: Simplify right side
    398,840.76x = 119,743,601,067.01
  5. Step 5: Solve for x
    x = 119,743,601,067.01/398,840.76
  6. Step 6: Final answer
    x = 300,229.10

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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.