Home / 20,900.08-31,340.04-12,137.20

Finding the Fourth Proportional to 20,900.08, 31,340.04 and 12,137.20

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Solution

The fourth proportional to 20,900.08, 31,340.04 and 12,137.20 is: 18,199.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,900.08 : 31,340.04 = 12,137.20 : x
  2. Step 2: Convert to fraction form
    20,900.08/31,340.04 = 12,137.20/x
  3. Step 3: Cross multiply
    20,900.08x = 31,340.04 × 12,137.20
  4. Step 4: Simplify right side
    20,900.08x = 380,380,333.49
  5. Step 5: Solve for x
    x = 380,380,333.49/20,900.08
  6. Step 6: Final answer
    x = 18,199.95

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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.