Home / 420,016.60-629,621.70-139,389.40

Finding the Fourth Proportional to 420,016.60, 629,621.70 and 139,389.40

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Solution

The fourth proportional to 420,016.60, 629,621.70 and 139,389.40 is: 208,950.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,016.60 : 629,621.70 = 139,389.40 : x
  2. Step 2: Convert to fraction form
    420,016.60/629,621.70 = 139,389.40/x
  3. Step 3: Cross multiply
    420,016.60x = 629,621.70 × 139,389.40
  4. Step 4: Simplify right side
    420,016.60x = 87,762,590,989.98
  5. Step 5: Solve for x
    x = 87,762,590,989.98/420,016.60
  6. Step 6: Final answer
    x = 208,950.29

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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.