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Finding the Fourth Proportional to 2,666.40, 3,999.60 and 1,279.41

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Solution

The fourth proportional to 2,666.40, 3,999.60 and 1,279.41 is: 1,919.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,666.40 : 3,999.60 = 1,279.41 : x
  2. Step 2: Convert to fraction form
    2,666.40/3,999.60 = 1,279.41/x
  3. Step 3: Cross multiply
    2,666.40x = 3,999.60 × 1,279.41
  4. Step 4: Simplify right side
    2,666.40x = 5,117,128.24
  5. Step 5: Solve for x
    x = 5,117,128.24/2,666.40
  6. Step 6: Final answer
    x = 1,919.12

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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.