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Finding the Fourth Proportional to 21,954.87, 30,286.31 and 13,458.98

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Solution

The fourth proportional to 21,954.87, 30,286.31 and 13,458.98 is: 18,566.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,954.87 : 30,286.31 = 13,458.98 : x
  2. Step 2: Convert to fraction form
    21,954.87/30,286.31 = 13,458.98/x
  3. Step 3: Cross multiply
    21,954.87x = 30,286.31 × 13,458.98
  4. Step 4: Simplify right side
    21,954.87x = 407,622,882.63
  5. Step 5: Solve for x
    x = 407,622,882.63/21,954.87
  6. Step 6: Final answer
    x = 18,566.40

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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.