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Finding the Fourth Proportional to 12,739.78, 17,581.05 and 7,074.88

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Solution

The fourth proportional to 12,739.78, 17,581.05 and 7,074.88 is: 9,763.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,739.78 : 17,581.05 = 7,074.88 : x
  2. Step 2: Convert to fraction form
    12,739.78/17,581.05 = 7,074.88/x
  3. Step 3: Cross multiply
    12,739.78x = 17,581.05 × 7,074.88
  4. Step 4: Simplify right side
    12,739.78x = 124,383,792.76
  5. Step 5: Solve for x
    x = 124,383,792.76/12,739.78
  6. Step 6: Final answer
    x = 9,763.42

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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.