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Finding the Fourth Proportional to 15,563.45, 21,477.74 and 8,489.99

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Solution

The fourth proportional to 15,563.45, 21,477.74 and 8,489.99 is: 11,716.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,563.45 : 21,477.74 = 8,489.99 : x
  2. Step 2: Convert to fraction form
    15,563.45/21,477.74 = 8,489.99/x
  3. Step 3: Cross multiply
    15,563.45x = 21,477.74 × 8,489.99
  4. Step 4: Simplify right side
    15,563.45x = 182,345,797.82
  5. Step 5: Solve for x
    x = 182,345,797.82/15,563.45
  6. Step 6: Final answer
    x = 11,716.28

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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.