Home / 420,021.60-629,629.20-139,394.40

Finding the Fourth Proportional to 420,021.60, 629,629.20 and 139,394.40

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Solution

The fourth proportional to 420,021.60, 629,629.20 and 139,394.40 is: 208,957.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,021.60 : 629,629.20 = 139,394.40 : x
  2. Step 2: Convert to fraction form
    420,021.60/629,629.20 = 139,394.40/x
  3. Step 3: Cross multiply
    420,021.60x = 629,629.20 × 139,394.40
  4. Step 4: Simplify right side
    420,021.60x = 87,766,784,556.48
  5. Step 5: Solve for x
    x = 87,766,784,556.48/420,021.60
  6. Step 6: Final answer
    x = 208,957.79

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.