Home / 13,988.36-20,981.86-5,222.60

Finding the Fourth Proportional to 13,988.36, 20,981.86 and 5,222.60

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Solution

The fourth proportional to 13,988.36, 20,981.86 and 5,222.60 is: 7,833.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,988.36 : 20,981.86 = 5,222.60 : x
  2. Step 2: Convert to fraction form
    13,988.36/20,981.86 = 5,222.60/x
  3. Step 3: Cross multiply
    13,988.36x = 20,981.86 × 5,222.60
  4. Step 4: Simplify right side
    13,988.36x = 109,579,862.04
  5. Step 5: Solve for x
    x = 109,579,862.04/13,988.36
  6. Step 6: Final answer
    x = 7,833.65

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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.