Home / 21,108.69-29,129.78-11,548.49

Finding the Fourth Proportional to 21,108.69, 29,129.78 and 11,548.49

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Solution

The fourth proportional to 21,108.69, 29,129.78 and 11,548.49 is: 15,936.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,108.69 : 29,129.78 = 11,548.49 : x
  2. Step 2: Convert to fraction form
    21,108.69/29,129.78 = 11,548.49/x
  3. Step 3: Cross multiply
    21,108.69x = 29,129.78 × 11,548.49
  4. Step 4: Simplify right side
    21,108.69x = 336,404,769.64
  5. Step 5: Solve for x
    x = 336,404,769.64/21,108.69
  6. Step 6: Final answer
    x = 15,936.79

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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.