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Finding the Fourth Proportional to 15,504.94, 21,395.94 and 8,431.36

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Solution

The fourth proportional to 15,504.94, 21,395.94 and 8,431.36 is: 11,634.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,504.94 : 21,395.94 = 8,431.36 : x
  2. Step 2: Convert to fraction form
    15,504.94/21,395.94 = 8,431.36/x
  3. Step 3: Cross multiply
    15,504.94x = 21,395.94 × 8,431.36
  4. Step 4: Simplify right side
    15,504.94x = 180,396,872.68
  5. Step 5: Solve for x
    x = 180,396,872.68/15,504.94
  6. Step 6: Final answer
    x = 11,634.80

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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.