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Finding the Fourth Proportional to 420,464.46, 630,791.73 and 139,992.78

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Solution

The fourth proportional to 420,464.46, 630,791.73 and 139,992.78 is: 210,020.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,464.46 : 630,791.73 = 139,992.78 : x
  2. Step 2: Convert to fraction form
    420,464.46/630,791.73 = 139,992.78/x
  3. Step 3: Cross multiply
    420,464.46x = 630,791.73 × 139,992.78
  4. Step 4: Simplify right side
    420,464.46x = 88,306,287,883.71
  5. Step 5: Solve for x
    x = 88,306,287,883.71/420,464.46
  6. Step 6: Final answer
    x = 210,020.81

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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.