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Finding the Fourth Proportional to 806.29, 1,207.26 and 420.73

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Solution

The fourth proportional to 806.29, 1,207.26 and 420.73 is: 629.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.29 : 1,207.26 = 420.73 : x
  2. Step 2: Convert to fraction form
    806.29/1,207.26 = 420.73/x
  3. Step 3: Cross multiply
    806.29x = 1,207.26 × 420.73
  4. Step 4: Simplify right side
    806.29x = 507,927.48
  5. Step 5: Solve for x
    x = 507,927.48/806.29
  6. Step 6: Final answer
    x = 629.96

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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.