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Finding the Fourth Proportional to 351,520.90, 485,107.71 and 215,629.78

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Solution

The fourth proportional to 351,520.90, 485,107.71 and 215,629.78 is: 297,574.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    351,520.90 : 485,107.71 = 215,629.78 : x
  2. Step 2: Convert to fraction form
    351,520.90/485,107.71 = 215,629.78/x
  3. Step 3: Cross multiply
    351,520.90x = 485,107.71 × 215,629.78
  4. Step 4: Simplify right side
    351,520.90x = 104,603,668,783.60
  5. Step 5: Solve for x
    x = 104,603,668,783.60/351,520.90
  6. Step 6: Final answer
    x = 297,574.54

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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.