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Finding the Fourth Proportional to 18,892.80, 28,314.90 and 11,489.40

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Solution

The fourth proportional to 18,892.80, 28,314.90 and 11,489.40 is: 17,219.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,892.80 : 28,314.90 = 11,489.40 : x
  2. Step 2: Convert to fraction form
    18,892.80/28,314.90 = 11,489.40/x
  3. Step 3: Cross multiply
    18,892.80x = 28,314.90 × 11,489.40
  4. Step 4: Simplify right side
    18,892.80x = 325,321,212.06
  5. Step 5: Solve for x
    x = 325,321,212.06/18,892.80
  6. Step 6: Final answer
    x = 17,219.32

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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.