Home / 21,121.37-29,145.51-12,621.80

Finding the Fourth Proportional to 21,121.37, 29,145.51 and 12,621.80

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Solution

The fourth proportional to 21,121.37, 29,145.51 and 12,621.80 is: 17,416.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,121.37 : 29,145.51 = 12,621.80 : x
  2. Step 2: Convert to fraction form
    21,121.37/29,145.51 = 12,621.80/x
  3. Step 3: Cross multiply
    21,121.37x = 29,145.51 × 12,621.80
  4. Step 4: Simplify right side
    21,121.37x = 367,868,902.54
  5. Step 5: Solve for x
    x = 367,868,902.54/21,121.37
  6. Step 6: Final answer
    x = 17,416.91

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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.