Home / 20,137.80-30,172.38-13,107.12

Finding the Fourth Proportional to 20,137.80, 30,172.38 and 13,107.12

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Solution

The fourth proportional to 20,137.80, 30,172.38 and 13,107.12 is: 19,638.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,137.80 : 30,172.38 = 13,107.12 : x
  2. Step 2: Convert to fraction form
    20,137.80/30,172.38 = 13,107.12/x
  3. Step 3: Cross multiply
    20,137.80x = 30,172.38 × 13,107.12
  4. Step 4: Simplify right side
    20,137.80x = 395,473,005.35
  5. Step 5: Solve for x
    x = 395,473,005.35/20,137.80
  6. Step 6: Final answer
    x = 19,638.34

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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.