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Finding the Fourth Proportional to 21,816.99, 30,107.72 and 11,880.99

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Solution

The fourth proportional to 21,816.99, 30,107.72 and 11,880.99 is: 16,395.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,816.99 : 30,107.72 = 11,880.99 : x
  2. Step 2: Convert to fraction form
    21,816.99/30,107.72 = 11,880.99/x
  3. Step 3: Cross multiply
    21,816.99x = 30,107.72 × 11,880.99
  4. Step 4: Simplify right side
    21,816.99x = 357,709,460.84
  5. Step 5: Solve for x
    x = 357,709,460.84/21,816.99
  6. Step 6: Final answer
    x = 16,395.91

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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.