Home / 12,618.30-17,403.99-8,139.78

Finding the Fourth Proportional to 12,618.30, 17,403.99 and 8,139.78

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Solution

The fourth proportional to 12,618.30, 17,403.99 and 8,139.78 is: 11,226.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,618.30 : 17,403.99 = 8,139.78 : x
  2. Step 2: Convert to fraction form
    12,618.30/17,403.99 = 8,139.78/x
  3. Step 3: Cross multiply
    12,618.30x = 17,403.99 × 8,139.78
  4. Step 4: Simplify right side
    12,618.30x = 141,664,649.72
  5. Step 5: Solve for x
    x = 141,664,649.72/12,618.30
  6. Step 6: Final answer
    x = 11,226.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.