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Finding the Fourth Proportional to 9,212.80, 13,819.20 and 8,636.80

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Solution

The fourth proportional to 9,212.80, 13,819.20 and 8,636.80 is: 12,955.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,212.80 : 13,819.20 = 8,636.80 : x
  2. Step 2: Convert to fraction form
    9,212.80/13,819.20 = 8,636.80/x
  3. Step 3: Cross multiply
    9,212.80x = 13,819.20 × 8,636.80
  4. Step 4: Simplify right side
    9,212.80x = 119,353,666.56
  5. Step 5: Solve for x
    x = 119,353,666.56/9,212.80
  6. Step 6: Final answer
    x = 12,955.20

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1.5x scale

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.