Home / 21,115.78-29,134.80-12,616.24

Finding the Fourth Proportional to 21,115.78, 29,134.80 and 12,616.24

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Solution

The fourth proportional to 21,115.78, 29,134.80 and 12,616.24 is: 17,407.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,115.78 : 29,134.80 = 12,616.24 : x
  2. Step 2: Convert to fraction form
    21,115.78/29,134.80 = 12,616.24/x
  3. Step 3: Cross multiply
    21,115.78x = 29,134.80 × 12,616.24
  4. Step 4: Simplify right side
    21,115.78x = 367,571,629.15
  5. Step 5: Solve for x
    x = 367,571,629.15/21,115.78
  6. Step 6: Final answer
    x = 17,407.44

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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.