Home / 21,118.80-29,143.17-12,166.68

Finding the Fourth Proportional to 21,118.80, 29,143.17 and 12,166.68

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Solution

The fourth proportional to 21,118.80, 29,143.17 and 12,166.68 is: 16,789.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,118.80 : 29,143.17 = 12,166.68 : x
  2. Step 2: Convert to fraction form
    21,118.80/29,143.17 = 12,166.68/x
  3. Step 3: Cross multiply
    21,118.80x = 29,143.17 × 12,166.68
  4. Step 4: Simplify right side
    21,118.80x = 354,575,623.58
  5. Step 5: Solve for x
    x = 354,575,623.58/21,118.80
  6. Step 6: Final answer
    x = 16,789.57

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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.