Home / 13,991.84-20,981.28-5,220.44

Finding the Fourth Proportional to 13,991.84, 20,981.28 and 5,220.44

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Solution

The fourth proportional to 13,991.84, 20,981.28 and 5,220.44 is: 7,828.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,991.84 : 20,981.28 = 5,220.44 : x
  2. Step 2: Convert to fraction form
    13,991.84/20,981.28 = 5,220.44/x
  3. Step 3: Cross multiply
    13,991.84x = 20,981.28 × 5,220.44
  4. Step 4: Simplify right side
    13,991.84x = 109,531,513.36
  5. Step 5: Solve for x
    x = 109,531,513.36/13,991.84
  6. Step 6: Final answer
    x = 7,828.24

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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.