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Finding the Fourth Proportional to 18,807.80, 28,218.90 and 18,512.60

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Solution

The fourth proportional to 18,807.80, 28,218.90 and 18,512.60 is: 27,775.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,807.80 : 28,218.90 = 18,512.60 : x
  2. Step 2: Convert to fraction form
    18,807.80/28,218.90 = 18,512.60/x
  3. Step 3: Cross multiply
    18,807.80x = 28,218.90 × 18,512.60
  4. Step 4: Simplify right side
    18,807.80x = 522,405,208.14
  5. Step 5: Solve for x
    x = 522,405,208.14/18,807.80
  6. Step 6: Final answer
    x = 27,775.99

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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.