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Finding the Fourth Proportional to 18,809.20, 28,181.40 and 8,927.20

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Solution

The fourth proportional to 18,809.20, 28,181.40 and 8,927.20 is: 13,375.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,809.20 : 28,181.40 = 8,927.20 : x
  2. Step 2: Convert to fraction form
    18,809.20/28,181.40 = 8,927.20/x
  3. Step 3: Cross multiply
    18,809.20x = 28,181.40 × 8,927.20
  4. Step 4: Simplify right side
    18,809.20x = 251,580,994.08
  5. Step 5: Solve for x
    x = 251,580,994.08/18,809.20
  6. Step 6: Final answer
    x = 13,375.42

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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.