Home / 21,112.32-31,660.80-20,144.64

Finding the Fourth Proportional to 21,112.32, 31,660.80 and 20,144.64

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Solution

The fourth proportional to 21,112.32, 31,660.80 and 20,144.64 is: 30,209.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,112.32 : 31,660.80 = 20,144.64 : x
  2. Step 2: Convert to fraction form
    21,112.32/31,660.80 = 20,144.64/x
  3. Step 3: Cross multiply
    21,112.32x = 31,660.80 × 20,144.64
  4. Step 4: Simplify right side
    21,112.32x = 637,795,418.11
  5. Step 5: Solve for x
    x = 637,795,418.11/21,112.32
  6. Step 6: Final answer
    x = 30,209.63

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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.