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Finding the Fourth Proportional to 138,786.48, 191,512.44 and 85,060.80

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Solution

The fourth proportional to 138,786.48, 191,512.44 and 85,060.80 is: 117,376.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,786.48 : 191,512.44 = 85,060.80 : x
  2. Step 2: Convert to fraction form
    138,786.48/191,512.44 = 85,060.80/x
  3. Step 3: Cross multiply
    138,786.48x = 191,512.44 × 85,060.80
  4. Step 4: Simplify right side
    138,786.48x = 16,290,201,356.35
  5. Step 5: Solve for x
    x = 16,290,201,356.35/138,786.48
  6. Step 6: Final answer
    x = 117,376.00

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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.