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Finding the Fourth Proportional to 18,807.98, 28,212.60 and 7,122.02

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Solution

The fourth proportional to 18,807.98, 28,212.60 and 7,122.02 is: 10,683.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,807.98 : 28,212.60 = 7,122.02 : x
  2. Step 2: Convert to fraction form
    18,807.98/28,212.60 = 7,122.02/x
  3. Step 3: Cross multiply
    18,807.98x = 28,212.60 × 7,122.02
  4. Step 4: Simplify right side
    18,807.98x = 200,930,701.45
  5. Step 5: Solve for x
    x = 200,930,701.45/18,807.98
  6. Step 6: Final answer
    x = 10,683.27

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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.