Home / 12,126.13-18,189.20-3,918.13

Finding the Fourth Proportional to 12,126.13, 18,189.20 and 3,918.13

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Solution

The fourth proportional to 12,126.13, 18,189.20 and 3,918.13 is: 5,877.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,126.13 : 18,189.20 = 3,918.13 : x
  2. Step 2: Convert to fraction form
    12,126.13/18,189.20 = 3,918.13/x
  3. Step 3: Cross multiply
    12,126.13x = 18,189.20 × 3,918.13
  4. Step 4: Simplify right side
    12,126.13x = 71,267,650.20
  5. Step 5: Solve for x
    x = 71,267,650.20/12,126.13
  6. Step 6: Final answer
    x = 5,877.20

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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.