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Finding the Fourth Proportional to 12,019.20, 18,028.80 and 5,458.20

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Solution

The fourth proportional to 12,019.20, 18,028.80 and 5,458.20 is: 8,187.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,019.20 : 18,028.80 = 5,458.20 : x
  2. Step 2: Convert to fraction form
    12,019.20/18,028.80 = 5,458.20/x
  3. Step 3: Cross multiply
    12,019.20x = 18,028.80 × 5,458.20
  4. Step 4: Simplify right side
    12,019.20x = 98,404,796.16
  5. Step 5: Solve for x
    x = 98,404,796.16/12,019.20
  6. Step 6: Final answer
    x = 8,187.30

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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.