Home / 21,299.80-29,391.48-13,122.12

Finding the Fourth Proportional to 21,299.80, 29,391.48 and 13,122.12

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Solution

The fourth proportional to 21,299.80, 29,391.48 and 13,122.12 is: 18,107.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,299.80 : 29,391.48 = 13,122.12 : x
  2. Step 2: Convert to fraction form
    21,299.80/29,391.48 = 13,122.12/x
  3. Step 3: Cross multiply
    21,299.80x = 29,391.48 × 13,122.12
  4. Step 4: Simplify right side
    21,299.80x = 385,678,527.54
  5. Step 5: Solve for x
    x = 385,678,527.54/21,299.80
  6. Step 6: Final answer
    x = 18,107.14

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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.