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Finding the Fourth Proportional to 15,794.60, 21,796.56 and 8,721

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Solution

The fourth proportional to 15,794.60, 21,796.56 and 8,721 is: 12,034.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,794.60 : 21,796.56 = 8,721 : x
  2. Step 2: Convert to fraction form
    15,794.60/21,796.56 = 8,721/x
  3. Step 3: Cross multiply
    15,794.60x = 21,796.56 × 8,721
  4. Step 4: Simplify right side
    15,794.60x = 190,087,799.76
  5. Step 5: Solve for x
    x = 190,087,799.76/15,794.60
  6. Step 6: Final answer
    x = 12,034.99

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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.