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Finding the Fourth Proportional to 138,803.56, 191,548.92 and 75,141.88

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Solution

The fourth proportional to 138,803.56, 191,548.92 and 75,141.88 is: 103,695.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,803.56 : 191,548.92 = 75,141.88 : x
  2. Step 2: Convert to fraction form
    138,803.56/191,548.92 = 75,141.88/x
  3. Step 3: Cross multiply
    138,803.56x = 191,548.92 × 75,141.88
  4. Step 4: Simplify right side
    138,803.56x = 14,393,345,960.77
  5. Step 5: Solve for x
    x = 14,393,345,960.77/138,803.56
  6. Step 6: Final answer
    x = 103,695.80

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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.