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Finding the Fourth Proportional to 8,612, 12,918.10 and 2,768.60

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Solution

The fourth proportional to 8,612, 12,918.10 and 2,768.60 is: 4,152.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,612 : 12,918.10 = 2,768.60 : x
  2. Step 2: Convert to fraction form
    8,612/12,918.10 = 2,768.60/x
  3. Step 3: Cross multiply
    8,612x = 12,918.10 × 2,768.60
  4. Step 4: Simplify right side
    8,612x = 35,765,051.66
  5. Step 5: Solve for x
    x = 35,765,051.66/8,612
  6. Step 6: Final answer
    x = 4,152.93

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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.