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Finding the Fourth Proportional to 18,819.16, 28,236.18 and 7,135.48

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Solution

The fourth proportional to 18,819.16, 28,236.18 and 7,135.48 is: 10,706.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,819.16 : 28,236.18 = 7,135.48 : x
  2. Step 2: Convert to fraction form
    18,819.16/28,236.18 = 7,135.48/x
  3. Step 3: Cross multiply
    18,819.16x = 28,236.18 × 7,135.48
  4. Step 4: Simplify right side
    18,819.16x = 201,478,697.67
  5. Step 5: Solve for x
    x = 201,478,697.67/18,819.16
  6. Step 6: Final answer
    x = 10,706.04

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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.