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Finding the Fourth Proportional to 2,571.64, 3,857.80 and 839.68

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Solution

The fourth proportional to 2,571.64, 3,857.80 and 839.68 is: 1,259.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,571.64 : 3,857.80 = 839.68 : x
  2. Step 2: Convert to fraction form
    2,571.64/3,857.80 = 839.68/x
  3. Step 3: Cross multiply
    2,571.64x = 3,857.80 × 839.68
  4. Step 4: Simplify right side
    2,571.64x = 3,239,317.50
  5. Step 5: Solve for x
    x = 3,239,317.50/2,571.64
  6. Step 6: Final answer
    x = 1,259.63

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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.