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Finding the Fourth Proportional to 13,990.35, 20,978.25 and 4,128.33

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Solution

The fourth proportional to 13,990.35, 20,978.25 and 4,128.33 is: 6,190.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,990.35 : 20,978.25 = 4,128.33 : x
  2. Step 2: Convert to fraction form
    13,990.35/20,978.25 = 4,128.33/x
  3. Step 3: Cross multiply
    13,990.35x = 20,978.25 × 4,128.33
  4. Step 4: Simplify right side
    13,990.35x = 86,605,138.82
  5. Step 5: Solve for x
    x = 86,605,138.82/13,990.35
  6. Step 6: Final answer
    x = 6,190.35

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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.