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Finding the Fourth Proportional to 216,694.90, 324,991.32 and 121,965.40

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Solution

The fourth proportional to 216,694.90, 324,991.32 and 121,965.40 is: 182,919.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,694.90 : 324,991.32 = 121,965.40 : x
  2. Step 2: Convert to fraction form
    216,694.90/324,991.32 = 121,965.40/x
  3. Step 3: Cross multiply
    216,694.90x = 324,991.32 × 121,965.40
  4. Step 4: Simplify right side
    216,694.90x = 39,637,696,340.33
  5. Step 5: Solve for x
    x = 39,637,696,340.33/216,694.90
  6. Step 6: Final answer
    x = 182,919.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.