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Finding the Fourth Proportional to 15,974.82, 21,997.70 and 15,620.80

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Solution

The fourth proportional to 15,974.82, 21,997.70 and 15,620.80 is: 21,510.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,974.82 : 21,997.70 = 15,620.80 : x
  2. Step 2: Convert to fraction form
    15,974.82/21,997.70 = 15,620.80/x
  3. Step 3: Cross multiply
    15,974.82x = 21,997.70 × 15,620.80
  4. Step 4: Simplify right side
    15,974.82x = 343,621,672.16
  5. Step 5: Solve for x
    x = 343,621,672.16/15,974.82
  6. Step 6: Final answer
    x = 21,510.21

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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.