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Finding the Fourth Proportional to 19,209.30, 28,819.35 and 8,121.30

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Solution

The fourth proportional to 19,209.30, 28,819.35 and 8,121.30 is: 12,184.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,209.30 : 28,819.35 = 8,121.30 : x
  2. Step 2: Convert to fraction form
    19,209.30/28,819.35 = 8,121.30/x
  3. Step 3: Cross multiply
    19,209.30x = 28,819.35 × 8,121.30
  4. Step 4: Simplify right side
    19,209.30x = 234,050,587.16
  5. Step 5: Solve for x
    x = 234,050,587.16/19,209.30
  6. Step 6: Final answer
    x = 12,184.23

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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.