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Finding the Fourth Proportional to 100,487.79, 138,672.81 and 55,164.65

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Solution

The fourth proportional to 100,487.79, 138,672.81 and 55,164.65 is: 76,127.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,487.79 : 138,672.81 = 55,164.65 : x
  2. Step 2: Convert to fraction form
    100,487.79/138,672.81 = 55,164.65/x
  3. Step 3: Cross multiply
    100,487.79x = 138,672.81 × 55,164.65
  4. Step 4: Simplify right side
    100,487.79x = 7,649,836,334.80
  5. Step 5: Solve for x
    x = 7,649,836,334.80/100,487.79
  6. Step 6: Final answer
    x = 76,127.02

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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.