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Finding the Fourth Proportional to 2,126.60, 3,189.69 and 665.63

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Solution

The fourth proportional to 2,126.60, 3,189.69 and 665.63 is: 998.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,126.60 : 3,189.69 = 665.63 : x
  2. Step 2: Convert to fraction form
    2,126.60/3,189.69 = 665.63/x
  3. Step 3: Cross multiply
    2,126.60x = 3,189.69 × 665.63
  4. Step 4: Simplify right side
    2,126.60x = 2,123,137.41
  5. Step 5: Solve for x
    x = 2,123,137.41/2,126.60
  6. Step 6: Final answer
    x = 998.37

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1.5x scale

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.