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Finding the Fourth Proportional to 18,739.74, 28,075.74 and 11,716.41

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Solution

The fourth proportional to 18,739.74, 28,075.74 and 11,716.41 is: 17,553.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,739.74 : 28,075.74 = 11,716.41 : x
  2. Step 2: Convert to fraction form
    18,739.74/28,075.74 = 11,716.41/x
  3. Step 3: Cross multiply
    18,739.74x = 28,075.74 × 11,716.41
  4. Step 4: Simplify right side
    18,739.74x = 328,946,880.89
  5. Step 5: Solve for x
    x = 328,946,880.89/18,739.74
  6. Step 6: Final answer
    x = 17,553.44

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.