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Finding the Fourth Proportional to 18,442.80, 27,631.20 and 11,216.80

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Solution

The fourth proportional to 18,442.80, 27,631.20 and 11,216.80 is: 16,805.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,442.80 : 27,631.20 = 11,216.80 : x
  2. Step 2: Convert to fraction form
    18,442.80/27,631.20 = 11,216.80/x
  3. Step 3: Cross multiply
    18,442.80x = 27,631.20 × 11,216.80
  4. Step 4: Simplify right side
    18,442.80x = 309,933,644.16
  5. Step 5: Solve for x
    x = 309,933,644.16/18,442.80
  6. Step 6: Final answer
    x = 16,805.13

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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.