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Finding the Fourth Proportional to 13,995.78, 20,989.50 and 4,134.84

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Solution

The fourth proportional to 13,995.78, 20,989.50 and 4,134.84 is: 6,201.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,995.78 : 20,989.50 = 4,134.84 : x
  2. Step 2: Convert to fraction form
    13,995.78/20,989.50 = 4,134.84/x
  3. Step 3: Cross multiply
    13,995.78x = 20,989.50 × 4,134.84
  4. Step 4: Simplify right side
    13,995.78x = 86,788,224.18
  5. Step 5: Solve for x
    x = 86,788,224.18/13,995.78
  6. Step 6: Final answer
    x = 6,201.03

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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.