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Finding the Fourth Proportional to 13,919.70, 20,851.70 and 8,369.99

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Solution

The fourth proportional to 13,919.70, 20,851.70 and 8,369.99 is: 12,538.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,919.70 : 20,851.70 = 8,369.99 : x
  2. Step 2: Convert to fraction form
    13,919.70/20,851.70 = 8,369.99/x
  3. Step 3: Cross multiply
    13,919.70x = 20,851.70 × 8,369.99
  4. Step 4: Simplify right side
    13,919.70x = 174,528,416.22
  5. Step 5: Solve for x
    x = 174,528,416.22/13,919.70
  6. Step 6: Final answer
    x = 12,538.23

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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.