Home / 13,411.71-18,517.14-11,990.79

Finding the Fourth Proportional to 13,411.71, 18,517.14 and 11,990.79

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Solution

The fourth proportional to 13,411.71, 18,517.14 and 11,990.79 is: 16,555.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,411.71 : 18,517.14 = 11,990.79 : x
  2. Step 2: Convert to fraction form
    13,411.71/18,517.14 = 11,990.79/x
  3. Step 3: Cross multiply
    13,411.71x = 18,517.14 × 11,990.79
  4. Step 4: Simplify right side
    13,411.71x = 222,035,137.14
  5. Step 5: Solve for x
    x = 222,035,137.14/13,411.71
  6. Step 6: Final answer
    x = 16,555.32

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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.