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Finding the Fourth Proportional to 21,491, 29,660.82 and 13,112.36

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Solution

The fourth proportional to 21,491, 29,660.82 and 13,112.36 is: 18,097.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,491 : 29,660.82 = 13,112.36 : x
  2. Step 2: Convert to fraction form
    21,491/29,660.82 = 13,112.36/x
  3. Step 3: Cross multiply
    21,491x = 29,660.82 × 13,112.36
  4. Step 4: Simplify right side
    21,491x = 388,923,349.74
  5. Step 5: Solve for x
    x = 388,923,349.74/21,491
  6. Step 6: Final answer
    x = 18,097.03

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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.