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Finding the Fourth Proportional to 18,958.90, 28,378.37 and 11,914.53

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Solution

The fourth proportional to 18,958.90, 28,378.37 and 11,914.53 is: 17,834.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,958.90 : 28,378.37 = 11,914.53 : x
  2. Step 2: Convert to fraction form
    18,958.90/28,378.37 = 11,914.53/x
  3. Step 3: Cross multiply
    18,958.90x = 28,378.37 × 11,914.53
  4. Step 4: Simplify right side
    18,958.90x = 338,114,940.72
  5. Step 5: Solve for x
    x = 338,114,940.72/18,958.90
  6. Step 6: Final answer
    x = 17,834.10

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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.