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Finding the Fourth Proportional to 138,666.92, 191,343.87 and 78,234.03

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Solution

The fourth proportional to 138,666.92, 191,343.87 and 78,234.03 is: 107,953.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,666.92 : 191,343.87 = 78,234.03 : x
  2. Step 2: Convert to fraction form
    138,666.92/191,343.87 = 78,234.03/x
  3. Step 3: Cross multiply
    138,666.92x = 191,343.87 × 78,234.03
  4. Step 4: Simplify right side
    138,666.92x = 14,969,602,065.90
  5. Step 5: Solve for x
    x = 14,969,602,065.90/138,666.92
  6. Step 6: Final answer
    x = 107,953.67

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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.