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Finding the Fourth Proportional to 18,968.12, 28,464.87 and 7,874.81

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Solution

The fourth proportional to 18,968.12, 28,464.87 and 7,874.81 is: 11,817.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,968.12 : 28,464.87 = 7,874.81 : x
  2. Step 2: Convert to fraction form
    18,968.12/28,464.87 = 7,874.81/x
  3. Step 3: Cross multiply
    18,968.12x = 28,464.87 × 7,874.81
  4. Step 4: Simplify right side
    18,968.12x = 224,155,403.55
  5. Step 5: Solve for x
    x = 224,155,403.55/18,968.12
  6. Step 6: Final answer
    x = 11,817.48

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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.