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Finding the Fourth Proportional to 12,912.39, 17,819.28 and 7,169.67

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Solution

The fourth proportional to 12,912.39, 17,819.28 and 7,169.67 is: 9,894.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,912.39 : 17,819.28 = 7,169.67 : x
  2. Step 2: Convert to fraction form
    12,912.39/17,819.28 = 7,169.67/x
  3. Step 3: Cross multiply
    12,912.39x = 17,819.28 × 7,169.67
  4. Step 4: Simplify right side
    12,912.39x = 127,758,357.24
  5. Step 5: Solve for x
    x = 127,758,357.24/12,912.39
  6. Step 6: Final answer
    x = 9,894.25

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.