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Finding the Fourth Proportional to 18,670, 28,005.12 and 4,819.12

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Solution

The fourth proportional to 18,670, 28,005.12 and 4,819.12 is: 7,228.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,670 : 28,005.12 = 4,819.12 : x
  2. Step 2: Convert to fraction form
    18,670/28,005.12 = 4,819.12/x
  3. Step 3: Cross multiply
    18,670x = 28,005.12 × 4,819.12
  4. Step 4: Simplify right side
    18,670x = 134,960,033.89
  5. Step 5: Solve for x
    x = 134,960,033.89/18,670
  6. Step 6: Final answer
    x = 7,228.71

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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.