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Finding the Fourth Proportional to 12,375.90, 17,078.72 and 6,786.90

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Solution

The fourth proportional to 12,375.90, 17,078.72 and 6,786.90 is: 9,365.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,375.90 : 17,078.72 = 6,786.90 : x
  2. Step 2: Convert to fraction form
    12,375.90/17,078.72 = 6,786.90/x
  3. Step 3: Cross multiply
    12,375.90x = 17,078.72 × 6,786.90
  4. Step 4: Simplify right side
    12,375.90x = 115,911,581.74
  5. Step 5: Solve for x
    x = 115,911,581.74/12,375.90
  6. Step 6: Final answer
    x = 9,365.91

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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.