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Finding the Fourth Proportional to 221,680.69, 305,919.38 and 121,078.69

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Solution

The fourth proportional to 221,680.69, 305,919.38 and 121,078.69 is: 167,088.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,680.69 : 305,919.38 = 121,078.69 : x
  2. Step 2: Convert to fraction form
    221,680.69/305,919.38 = 121,078.69/x
  3. Step 3: Cross multiply
    221,680.69x = 305,919.38 × 121,078.69
  4. Step 4: Simplify right side
    221,680.69x = 37,040,317,313.91
  5. Step 5: Solve for x
    x = 37,040,317,313.91/221,680.69
  6. Step 6: Final answer
    x = 167,088.61

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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.