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Finding the Fourth Proportional to 15,709.88, 21,678.80 and 8,634.94

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Solution

The fourth proportional to 15,709.88, 21,678.80 and 8,634.94 is: 11,915.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,709.88 : 21,678.80 = 8,634.94 : x
  2. Step 2: Convert to fraction form
    15,709.88/21,678.80 = 8,634.94/x
  3. Step 3: Cross multiply
    15,709.88x = 21,678.80 × 8,634.94
  4. Step 4: Simplify right side
    15,709.88x = 187,195,137.27
  5. Step 5: Solve for x
    x = 187,195,137.27/15,709.88
  6. Step 6: Final answer
    x = 11,915.76

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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.