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Finding the Fourth Proportional to 2,666.66, 4,000.40 and 1,279.74

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Solution

The fourth proportional to 2,666.66, 4,000.40 and 1,279.74 is: 1,919.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,666.66 : 4,000.40 = 1,279.74 : x
  2. Step 2: Convert to fraction form
    2,666.66/4,000.40 = 1,279.74/x
  3. Step 3: Cross multiply
    2,666.66x = 4,000.40 × 1,279.74
  4. Step 4: Simplify right side
    2,666.66x = 5,119,475.10
  5. Step 5: Solve for x
    x = 5,119,475.10/2,666.66
  6. Step 6: Final answer
    x = 1,919.81

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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.