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Finding the Fourth Proportional to 18,420.60, 27,617.40 and 7,321.80

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Solution

The fourth proportional to 18,420.60, 27,617.40 and 7,321.80 is: 10,977.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,420.60 : 27,617.40 = 7,321.80 : x
  2. Step 2: Convert to fraction form
    18,420.60/27,617.40 = 7,321.80/x
  3. Step 3: Cross multiply
    18,420.60x = 27,617.40 × 7,321.80
  4. Step 4: Simplify right side
    18,420.60x = 202,209,079.32
  5. Step 5: Solve for x
    x = 202,209,079.32/18,420.60
  6. Step 6: Final answer
    x = 10,977.33

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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.