Home / 21,121.36-29,146.56-11,689.36

Finding the Fourth Proportional to 21,121.36, 29,146.56 and 11,689.36

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Solution

The fourth proportional to 21,121.36, 29,146.56 and 11,689.36 is: 16,130.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,121.36 : 29,146.56 = 11,689.36 : x
  2. Step 2: Convert to fraction form
    21,121.36/29,146.56 = 11,689.36/x
  3. Step 3: Cross multiply
    21,121.36x = 29,146.56 × 11,689.36
  4. Step 4: Simplify right side
    21,121.36x = 340,704,632.60
  5. Step 5: Solve for x
    x = 340,704,632.60/21,121.36
  6. Step 6: Final answer
    x = 16,130.81

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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.