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Finding the Fourth Proportional to 420,791.20, 631,269.11 and 154,553.72

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Solution

The fourth proportional to 420,791.20, 631,269.11 and 154,553.72 is: 231,860.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,791.20 : 631,269.11 = 154,553.72 : x
  2. Step 2: Convert to fraction form
    420,791.20/631,269.11 = 154,553.72/x
  3. Step 3: Cross multiply
    420,791.20x = 631,269.11 × 154,553.72
  4. Step 4: Simplify right side
    420,791.20x = 97,564,986,501.63
  5. Step 5: Solve for x
    x = 97,564,986,501.63/420,791.20
  6. Step 6: Final answer
    x = 231,860.81

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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.