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Finding the Fourth Proportional to 18,573.21, 27,872.91 and 8,712.81

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Solution

The fourth proportional to 18,573.21, 27,872.91 and 8,712.81 is: 13,075.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,573.21 : 27,872.91 = 8,712.81 : x
  2. Step 2: Convert to fraction form
    18,573.21/27,872.91 = 8,712.81/x
  3. Step 3: Cross multiply
    18,573.21x = 27,872.91 × 8,712.81
  4. Step 4: Simplify right side
    18,573.21x = 242,851,368.98
  5. Step 5: Solve for x
    x = 242,851,368.98/18,573.21
  6. Step 6: Final answer
    x = 13,075.36

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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.