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Finding the Fourth Proportional to 15,439, 21,308.70 and 8,815

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Solution

The fourth proportional to 15,439, 21,308.70 and 8,815 is: 12,166.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,439 : 21,308.70 = 8,815 : x
  2. Step 2: Convert to fraction form
    15,439/21,308.70 = 8,815/x
  3. Step 3: Cross multiply
    15,439x = 21,308.70 × 8,815
  4. Step 4: Simplify right side
    15,439x = 187,836,190.50
  5. Step 5: Solve for x
    x = 187,836,190.50/15,439
  6. Step 6: Final answer
    x = 12,166.34

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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.