Home / 12,139.88-18,215.28-6,945.75

Finding the Fourth Proportional to 12,139.88, 18,215.28 and 6,945.75

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Solution

The fourth proportional to 12,139.88, 18,215.28 and 6,945.75 is: 10,421.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,139.88 : 18,215.28 = 6,945.75 : x
  2. Step 2: Convert to fraction form
    12,139.88/18,215.28 = 6,945.75/x
  3. Step 3: Cross multiply
    12,139.88x = 18,215.28 × 6,945.75
  4. Step 4: Simplify right side
    12,139.88x = 126,518,781.06
  5. Step 5: Solve for x
    x = 126,518,781.06/12,139.88
  6. Step 6: Final answer
    x = 10,421.75

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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.