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Finding the Fourth Proportional to 18,492.60, 27,768.60 and 17,128.20

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Solution

The fourth proportional to 18,492.60, 27,768.60 and 17,128.20 is: 25,719.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,492.60 : 27,768.60 = 17,128.20 : x
  2. Step 2: Convert to fraction form
    18,492.60/27,768.60 = 17,128.20/x
  3. Step 3: Cross multiply
    18,492.60x = 27,768.60 × 17,128.20
  4. Step 4: Simplify right side
    18,492.60x = 475,626,134.52
  5. Step 5: Solve for x
    x = 475,626,134.52/18,492.60
  6. Step 6: Final answer
    x = 25,719.81

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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.