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Finding the Fourth Proportional to 117,380.61, 161,983.26 and 66,391.31

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Solution

The fourth proportional to 117,380.61, 161,983.26 and 66,391.31 is: 91,618.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    117,380.61 : 161,983.26 = 66,391.31 : x
  2. Step 2: Convert to fraction form
    117,380.61/161,983.26 = 66,391.31/x
  3. Step 3: Cross multiply
    117,380.61x = 161,983.26 × 66,391.31
  4. Step 4: Simplify right side
    117,380.61x = 10,754,281,234.43
  5. Step 5: Solve for x
    x = 10,754,281,234.43/117,380.61
  6. Step 6: Final answer
    x = 91,618.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.