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Finding the Fourth Proportional to 321,387.66, 482,012.28 and 131,661.98

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Solution

The fourth proportional to 321,387.66, 482,012.28 and 131,661.98 is: 197,464.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,387.66 : 482,012.28 = 131,661.98 : x
  2. Step 2: Convert to fraction form
    321,387.66/482,012.28 = 131,661.98/x
  3. Step 3: Cross multiply
    321,387.66x = 482,012.28 × 131,661.98
  4. Step 4: Simplify right side
    321,387.66x = 63,462,691,169.11
  5. Step 5: Solve for x
    x = 63,462,691,169.11/321,387.66
  6. Step 6: Final answer
    x = 197,464.62

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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.