Home / 420,011.60-629,614.20-139,384.40

Finding the Fourth Proportional to 420,011.60, 629,614.20 and 139,384.40

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Solution

The fourth proportional to 420,011.60, 629,614.20 and 139,384.40 is: 208,942.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,011.60 : 629,614.20 = 139,384.40 : x
  2. Step 2: Convert to fraction form
    420,011.60/629,614.20 = 139,384.40/x
  3. Step 3: Cross multiply
    420,011.60x = 629,614.20 × 139,384.40
  4. Step 4: Simplify right side
    420,011.60x = 87,758,397,498.48
  5. Step 5: Solve for x
    x = 87,758,397,498.48/420,011.60
  6. Step 6: Final answer
    x = 208,942.79

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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.