Home / 21,980.12-33,142.59-20,143.04

Finding the Fourth Proportional to 21,980.12, 33,142.59 and 20,143.04

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Solution

The fourth proportional to 21,980.12, 33,142.59 and 20,143.04 is: 30,372.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,980.12 : 33,142.59 = 20,143.04 : x
  2. Step 2: Convert to fraction form
    21,980.12/33,142.59 = 20,143.04/x
  3. Step 3: Cross multiply
    21,980.12x = 33,142.59 × 20,143.04
  4. Step 4: Simplify right side
    21,980.12x = 667,592,516.07
  5. Step 5: Solve for x
    x = 667,592,516.07/21,980.12
  6. Step 6: Final answer
    x = 30,372.56

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.