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Finding the Fourth Proportional to 18,058.80, 27,078 and 8,431.20

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Solution

The fourth proportional to 18,058.80, 27,078 and 8,431.20 is: 12,642.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,058.80 : 27,078 = 8,431.20 : x
  2. Step 2: Convert to fraction form
    18,058.80/27,078 = 8,431.20/x
  3. Step 3: Cross multiply
    18,058.80x = 27,078 × 8,431.20
  4. Step 4: Simplify right side
    18,058.80x = 228,300,033.60
  5. Step 5: Solve for x
    x = 228,300,033.60/18,058.80
  6. Step 6: Final answer
    x = 12,642.04

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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.