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Finding the Fourth Proportional to 18,978.12, 26,190.84 and 11,022.84

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Solution

The fourth proportional to 18,978.12, 26,190.84 and 11,022.84 is: 15,212.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,978.12 : 26,190.84 = 11,022.84 : x
  2. Step 2: Convert to fraction form
    18,978.12/26,190.84 = 11,022.84/x
  3. Step 3: Cross multiply
    18,978.12x = 26,190.84 × 11,022.84
  4. Step 4: Simplify right side
    18,978.12x = 288,697,438.79
  5. Step 5: Solve for x
    x = 288,697,438.79/18,978.12
  6. Step 6: Final answer
    x = 15,212.12

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.