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Finding the Fourth Proportional to 420,891.09, 631,429.93 and 121,348.29

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Solution

The fourth proportional to 420,891.09, 631,429.93 and 121,348.29 is: 182,049.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,891.09 : 631,429.93 = 121,348.29 : x
  2. Step 2: Convert to fraction form
    420,891.09/631,429.93 = 121,348.29/x
  3. Step 3: Cross multiply
    420,891.09x = 631,429.93 × 121,348.29
  4. Step 4: Simplify right side
    420,891.09x = 76,622,941,228.07
  5. Step 5: Solve for x
    x = 76,622,941,228.07/420,891.09
  6. Step 6: Final answer
    x = 182,049.33

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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.