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Finding the Fourth Proportional to 15,798.70, 21,801.11 and 8,724.56

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Solution

The fourth proportional to 15,798.70, 21,801.11 and 8,724.56 is: 12,039.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,798.70 : 21,801.11 = 8,724.56 : x
  2. Step 2: Convert to fraction form
    15,798.70/21,801.11 = 8,724.56/x
  3. Step 3: Cross multiply
    15,798.70x = 21,801.11 × 8,724.56
  4. Step 4: Simplify right side
    15,798.70x = 190,205,103.14
  5. Step 5: Solve for x
    x = 190,205,103.14/15,798.70
  6. Step 6: Final answer
    x = 12,039.29

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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.