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Finding the Fourth Proportional to 18,518.80, 27,773.16 and 8,128.08

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Solution

The fourth proportional to 18,518.80, 27,773.16 and 8,128.08 is: 12,189.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,518.80 : 27,773.16 = 8,128.08 : x
  2. Step 2: Convert to fraction form
    18,518.80/27,773.16 = 8,128.08/x
  3. Step 3: Cross multiply
    18,518.80x = 27,773.16 × 8,128.08
  4. Step 4: Simplify right side
    18,518.80x = 225,742,466.33
  5. Step 5: Solve for x
    x = 225,742,466.33/18,518.80
  6. Step 6: Final answer
    x = 12,189.91

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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.