Home / 12,126.80-18,165.90-8,190.20

Finding the Fourth Proportional to 12,126.80, 18,165.90 and 8,190.20

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Solution

The fourth proportional to 12,126.80, 18,165.90 and 8,190.20 is: 12,268.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,126.80 : 18,165.90 = 8,190.20 : x
  2. Step 2: Convert to fraction form
    12,126.80/18,165.90 = 8,190.20/x
  3. Step 3: Cross multiply
    12,126.80x = 18,165.90 × 8,190.20
  4. Step 4: Simplify right side
    12,126.80x = 148,782,354.18
  5. Step 5: Solve for x
    x = 148,782,354.18/12,126.80
  6. Step 6: Final answer
    x = 12,268.89

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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.