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Finding the Fourth Proportional to 420,626.40, 630,939.60 and 252,664.80

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Solution

The fourth proportional to 420,626.40, 630,939.60 and 252,664.80 is: 378,997.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,626.40 : 630,939.60 = 252,664.80 : x
  2. Step 2: Convert to fraction form
    420,626.40/630,939.60 = 252,664.80/x
  3. Step 3: Cross multiply
    420,626.40x = 630,939.60 × 252,664.80
  4. Step 4: Simplify right side
    420,626.40x = 159,416,227,846.08
  5. Step 5: Solve for x
    x = 159,416,227,846.08/420,626.40
  6. Step 6: Final answer
    x = 378,997.20

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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.