Home / 21,121.15-29,145.21-12,621.59

Finding the Fourth Proportional to 21,121.15, 29,145.21 and 12,621.59

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Solution

The fourth proportional to 21,121.15, 29,145.21 and 12,621.59 is: 17,416.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,121.15 : 29,145.21 = 12,621.59 : x
  2. Step 2: Convert to fraction form
    21,121.15/29,145.21 = 12,621.59/x
  3. Step 3: Cross multiply
    21,121.15x = 29,145.21 × 12,621.59
  4. Step 4: Simplify right side
    21,121.15x = 367,858,745.36
  5. Step 5: Solve for x
    x = 367,858,745.36/21,121.15
  6. Step 6: Final answer
    x = 17,416.61

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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.