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Finding the Fourth Proportional to 18,781.94, 28,171.28 and 11,384.22

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Solution

The fourth proportional to 18,781.94, 28,171.28 and 11,384.22 is: 17,075.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,781.94 : 28,171.28 = 11,384.22 : x
  2. Step 2: Convert to fraction form
    18,781.94/28,171.28 = 11,384.22/x
  3. Step 3: Cross multiply
    18,781.94x = 28,171.28 × 11,384.22
  4. Step 4: Simplify right side
    18,781.94x = 320,708,049.20
  5. Step 5: Solve for x
    x = 320,708,049.20/18,781.94
  6. Step 6: Final answer
    x = 17,075.34

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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.