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Finding the Fourth Proportional to 15,914.19, 21,791.81 and 15,286.80

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Solution

The fourth proportional to 15,914.19, 21,791.81 and 15,286.80 is: 20,932.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,914.19 : 21,791.81 = 15,286.80 : x
  2. Step 2: Convert to fraction form
    15,914.19/21,791.81 = 15,286.80/x
  3. Step 3: Cross multiply
    15,914.19x = 21,791.81 × 15,286.80
  4. Step 4: Simplify right side
    15,914.19x = 333,127,041.11
  5. Step 5: Solve for x
    x = 333,127,041.11/15,914.19
  6. Step 6: Final answer
    x = 20,932.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.