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Finding the Fourth Proportional to 138,889.50, 191,679.30 and 78,471.24

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Solution

The fourth proportional to 138,889.50, 191,679.30 and 78,471.24 is: 108,296.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,889.50 : 191,679.30 = 78,471.24 : x
  2. Step 2: Convert to fraction form
    138,889.50/191,679.30 = 78,471.24/x
  3. Step 3: Cross multiply
    138,889.50x = 191,679.30 × 78,471.24
  4. Step 4: Simplify right side
    138,889.50x = 15,041,312,353.33
  5. Step 5: Solve for x
    x = 15,041,312,353.33/138,889.50
  6. Step 6: Final answer
    x = 108,296.97

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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.