Home / 420,187.50-630,286.72-139,704.75

Finding the Fourth Proportional to 420,187.50, 630,286.72 and 139,704.75

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Solution

The fourth proportional to 420,187.50, 630,286.72 and 139,704.75 is: 209,558.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,187.50 : 630,286.72 = 139,704.75 : x
  2. Step 2: Convert to fraction form
    420,187.50/630,286.72 = 139,704.75/x
  3. Step 3: Cross multiply
    420,187.50x = 630,286.72 × 139,704.75
  4. Step 4: Simplify right side
    420,187.50x = 88,054,048,296.66
  5. Step 5: Solve for x
    x = 88,054,048,296.66/420,187.50
  6. Step 6: Final answer
    x = 209,558.94

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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.