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Finding the Fourth Proportional to 12,620.70, 17,420.94 and 8,654.94

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Solution

The fourth proportional to 12,620.70, 17,420.94 and 8,654.94 is: 11,946.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,620.70 : 17,420.94 = 8,654.94 : x
  2. Step 2: Convert to fraction form
    12,620.70/17,420.94 = 8,654.94/x
  3. Step 3: Cross multiply
    12,620.70x = 17,420.94 × 8,654.94
  4. Step 4: Simplify right side
    12,620.70x = 150,777,190.44
  5. Step 5: Solve for x
    x = 150,777,190.44/12,620.70
  6. Step 6: Final answer
    x = 11,946.82

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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.