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Finding the Fourth Proportional to 13,991.84, 20,984.72 and 4,129.44

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Solution

The fourth proportional to 13,991.84, 20,984.72 and 4,129.44 is: 6,193.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,991.84 : 20,984.72 = 4,129.44 : x
  2. Step 2: Convert to fraction form
    13,991.84/20,984.72 = 4,129.44/x
  3. Step 3: Cross multiply
    13,991.84x = 20,984.72 × 4,129.44
  4. Step 4: Simplify right side
    13,991.84x = 86,655,142.16
  5. Step 5: Solve for x
    x = 86,655,142.16/13,991.84
  6. Step 6: Final answer
    x = 6,193.26

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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.