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Finding the Fourth Proportional to 138,940.84, 191,735.85 and 78,510.18

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Solution

The fourth proportional to 138,940.84, 191,735.85 and 78,510.18 is: 108,342.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,940.84 : 191,735.85 = 78,510.18 : x
  2. Step 2: Convert to fraction form
    138,940.84/191,735.85 = 78,510.18/x
  3. Step 3: Cross multiply
    138,940.84x = 191,735.85 × 78,510.18
  4. Step 4: Simplify right side
    138,940.84x = 15,053,216,095.95
  5. Step 5: Solve for x
    x = 15,053,216,095.95/138,940.84
  6. Step 6: Final answer
    x = 108,342.63

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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.