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Finding the Fourth Proportional to 18,412.80, 27,622.80 and 7,317.60

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Solution

The fourth proportional to 18,412.80, 27,622.80 and 7,317.60 is: 10,977.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,412.80 : 27,622.80 = 7,317.60 : x
  2. Step 2: Convert to fraction form
    18,412.80/27,622.80 = 7,317.60/x
  3. Step 3: Cross multiply
    18,412.80x = 27,622.80 × 7,317.60
  4. Step 4: Simplify right side
    18,412.80x = 202,132,601.28
  5. Step 5: Solve for x
    x = 202,132,601.28/18,412.80
  6. Step 6: Final answer
    x = 10,977.83

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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.