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Finding the Fourth Proportional to 13,671.05, 20,515.21 and 7,839.05

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Solution

The fourth proportional to 13,671.05, 20,515.21 and 7,839.05 is: 11,763.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,671.05 : 20,515.21 = 7,839.05 : x
  2. Step 2: Convert to fraction form
    13,671.05/20,515.21 = 7,839.05/x
  3. Step 3: Cross multiply
    13,671.05x = 20,515.21 × 7,839.05
  4. Step 4: Simplify right side
    13,671.05x = 160,819,634.78
  5. Step 5: Solve for x
    x = 160,819,634.78/13,671.05
  6. Step 6: Final answer
    x = 11,763.52

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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.