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Finding the Fourth Proportional to 138,802.46, 191,558.72 and 78,387.80

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Solution

The fourth proportional to 138,802.46, 191,558.72 and 78,387.80 is: 108,181.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,802.46 : 191,558.72 = 78,387.80 : x
  2. Step 2: Convert to fraction form
    138,802.46/191,558.72 = 78,387.80/x
  3. Step 3: Cross multiply
    138,802.46x = 191,558.72 × 78,387.80
  4. Step 4: Simplify right side
    138,802.46x = 15,015,866,718.57
  5. Step 5: Solve for x
    x = 15,015,866,718.57/138,802.46
  6. Step 6: Final answer
    x = 108,181.56

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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.