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Finding the Fourth Proportional to 420,023.20, 630,039.60 and 104,480.80

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Solution

The fourth proportional to 420,023.20, 630,039.60 and 104,480.80 is: 156,722.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,023.20 : 630,039.60 = 104,480.80 : x
  2. Step 2: Convert to fraction form
    420,023.20/630,039.60 = 104,480.80/x
  3. Step 3: Cross multiply
    420,023.20x = 630,039.60 × 104,480.80
  4. Step 4: Simplify right side
    420,023.20x = 65,827,041,439.68
  5. Step 5: Solve for x
    x = 65,827,041,439.68/420,023.20
  6. Step 6: Final answer
    x = 156,722.39

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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.