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Finding the Fourth Proportional to 18,819.17, 28,228.77 and 4,780.25

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Solution

The fourth proportional to 18,819.17, 28,228.77 and 4,780.25 is: 7,170.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,819.17 : 28,228.77 = 4,780.25 : x
  2. Step 2: Convert to fraction form
    18,819.17/28,228.77 = 4,780.25/x
  3. Step 3: Cross multiply
    18,819.17x = 28,228.77 × 4,780.25
  4. Step 4: Simplify right side
    18,819.17x = 134,940,577.79
  5. Step 5: Solve for x
    x = 134,940,577.79/18,819.17
  6. Step 6: Final answer
    x = 7,170.38

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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.