Home / 21,121.54-29,145.74-12,621.97

Finding the Fourth Proportional to 21,121.54, 29,145.74 and 12,621.97

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Solution

The fourth proportional to 21,121.54, 29,145.74 and 12,621.97 is: 17,417.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,121.54 : 29,145.74 = 12,621.97 : x
  2. Step 2: Convert to fraction form
    21,121.54/29,145.74 = 12,621.97/x
  3. Step 3: Cross multiply
    21,121.54x = 29,145.74 × 12,621.97
  4. Step 4: Simplify right side
    21,121.54x = 367,876,447.07
  5. Step 5: Solve for x
    x = 367,876,447.07/21,121.54
  6. Step 6: Final answer
    x = 17,417.13

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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.