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Finding the Fourth Proportional to 81,980.70, 113,185.60 and 66,909.31

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Solution

The fourth proportional to 81,980.70, 113,185.60 and 66,909.31 is: 92,377.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,980.70 : 113,185.60 = 66,909.31 : x
  2. Step 2: Convert to fraction form
    81,980.70/113,185.60 = 66,909.31/x
  3. Step 3: Cross multiply
    81,980.70x = 113,185.60 × 66,909.31
  4. Step 4: Simplify right side
    81,980.70x = 7,573,170,397.94
  5. Step 5: Solve for x
    x = 7,573,170,397.94/81,980.70
  6. Step 6: Final answer
    x = 92,377.48

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1.5x scale

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.