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Finding the Fourth Proportional to 121,896.83, 167,866.78 and 100,479.29

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Solution

The fourth proportional to 121,896.83, 167,866.78 and 100,479.29 is: 138,372.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,896.83 : 167,866.78 = 100,479.29 : x
  2. Step 2: Convert to fraction form
    121,896.83/167,866.78 = 100,479.29/x
  3. Step 3: Cross multiply
    121,896.83x = 167,866.78 × 100,479.29
  4. Step 4: Simplify right side
    121,896.83x = 16,867,133,966.85
  5. Step 5: Solve for x
    x = 16,867,133,966.85/121,896.83
  6. Step 6: Final answer
    x = 138,372.21

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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.