Home / 12,111.88-16,720.08-8,135.80

Finding the Fourth Proportional to 12,111.88, 16,720.08 and 8,135.80

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Solution

The fourth proportional to 12,111.88, 16,720.08 and 8,135.80 is: 11,231.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,111.88 : 16,720.08 = 8,135.80 : x
  2. Step 2: Convert to fraction form
    12,111.88/16,720.08 = 8,135.80/x
  3. Step 3: Cross multiply
    12,111.88x = 16,720.08 × 8,135.80
  4. Step 4: Simplify right side
    12,111.88x = 136,031,226.86
  5. Step 5: Solve for x
    x = 136,031,226.86/12,111.88
  6. Step 6: Final answer
    x = 11,231.22

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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.