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Finding the Fourth Proportional to 20,436.68, 30,642.71 and 13,326.21

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Solution

The fourth proportional to 20,436.68, 30,642.71 and 13,326.21 is: 19,981.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,436.68 : 30,642.71 = 13,326.21 : x
  2. Step 2: Convert to fraction form
    20,436.68/30,642.71 = 13,326.21/x
  3. Step 3: Cross multiply
    20,436.68x = 30,642.71 × 13,326.21
  4. Step 4: Simplify right side
    20,436.68x = 408,351,121.80
  5. Step 5: Solve for x
    x = 408,351,121.80/20,436.68
  6. Step 6: Final answer
    x = 19,981.29

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1.5x scale

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.