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Finding the Fourth Proportional to 2,164.05, 2,986.00 and 1,279.80

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Solution

The fourth proportional to 2,164.05, 2,986.00 and 1,279.80 is: 1,765.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,164.05 : 2,986.00 = 1,279.80 : x
  2. Step 2: Convert to fraction form
    2,164.05/2,986.00 = 1,279.80/x
  3. Step 3: Cross multiply
    2,164.05x = 2,986.00 × 1,279.80
  4. Step 4: Simplify right side
    2,164.05x = 3,821,479.60
  5. Step 5: Solve for x
    x = 3,821,479.60/2,164.05
  6. Step 6: Final answer
    x = 1,765.89

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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.