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Finding the Fourth Proportional to 15,709.94, 21,679.87 and 8,636.51

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Solution

The fourth proportional to 15,709.94, 21,679.87 and 8,636.51 is: 11,918.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,709.94 : 21,679.87 = 8,636.51 : x
  2. Step 2: Convert to fraction form
    15,709.94/21,679.87 = 8,636.51/x
  3. Step 3: Cross multiply
    15,709.94x = 21,679.87 × 8,636.51
  4. Step 4: Simplify right side
    15,709.94x = 187,238,414.05
  5. Step 5: Solve for x
    x = 187,238,414.05/15,709.94
  6. Step 6: Final answer
    x = 11,918.47

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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.