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Finding the Fourth Proportional to 100,168.56, 138,243.65 and 63,871.34

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Solution

The fourth proportional to 100,168.56, 138,243.65 and 63,871.34 is: 88,149.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,168.56 : 138,243.65 = 63,871.34 : x
  2. Step 2: Convert to fraction form
    100,168.56/138,243.65 = 63,871.34/x
  3. Step 3: Cross multiply
    100,168.56x = 138,243.65 × 63,871.34
  4. Step 4: Simplify right side
    100,168.56x = 8,829,806,161.42
  5. Step 5: Solve for x
    x = 8,829,806,161.42/100,168.56
  6. Step 6: Final answer
    x = 88,149.48

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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.