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Finding the Fourth Proportional to 15,507.99, 21,400.94 and 8,434.43

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Solution

The fourth proportional to 15,507.99, 21,400.94 and 8,434.43 is: 11,639.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,507.99 : 21,400.94 = 8,434.43 : x
  2. Step 2: Convert to fraction form
    15,507.99/21,400.94 = 8,434.43/x
  3. Step 3: Cross multiply
    15,507.99x = 21,400.94 × 8,434.43
  4. Step 4: Simplify right side
    15,507.99x = 180,504,724.70
  5. Step 5: Solve for x
    x = 180,504,724.70/15,507.99
  6. Step 6: Final answer
    x = 11,639.47

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.