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Finding the Fourth Proportional to 420,203.21, 630,489.83 and 220,475.43

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Solution

The fourth proportional to 420,203.21, 630,489.83 and 220,475.43 is: 330,810.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,203.21 : 630,489.83 = 220,475.43 : x
  2. Step 2: Convert to fraction form
    420,203.21/630,489.83 = 220,475.43/x
  3. Step 3: Cross multiply
    420,203.21x = 630,489.83 × 220,475.43
  4. Step 4: Simplify right side
    420,203.21x = 139,007,515,277.50
  5. Step 5: Solve for x
    x = 139,007,515,277.50/420,203.21
  6. Step 6: Final answer
    x = 330,810.22

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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.