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Finding the Fourth Proportional to 121,879.72, 168,195.30 and 71,579.56

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Solution

The fourth proportional to 121,879.72, 168,195.30 and 71,579.56 is: 98,780.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,879.72 : 168,195.30 = 71,579.56 : x
  2. Step 2: Convert to fraction form
    121,879.72/168,195.30 = 71,579.56/x
  3. Step 3: Cross multiply
    121,879.72x = 168,195.30 × 71,579.56
  4. Step 4: Simplify right side
    121,879.72x = 12,039,345,568.07
  5. Step 5: Solve for x
    x = 12,039,345,568.07/121,879.72
  6. Step 6: Final answer
    x = 98,780.55

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1.5x scale

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.