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Finding the Fourth Proportional to 138,756.92, 191,484.20 and 75,095.78

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Solution

The fourth proportional to 138,756.92, 191,484.20 and 75,095.78 is: 103,631.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,756.92 : 191,484.20 = 75,095.78 : x
  2. Step 2: Convert to fraction form
    138,756.92/191,484.20 = 75,095.78/x
  3. Step 3: Cross multiply
    138,756.92x = 191,484.20 × 75,095.78
  4. Step 4: Simplify right side
    138,756.92x = 14,379,654,586.99
  5. Step 5: Solve for x
    x = 14,379,654,586.99/138,756.92
  6. Step 6: Final answer
    x = 103,631.99

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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.