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Finding the Fourth Proportional to 3,571.50, 4,928.64 and 1,978.20

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Solution

The fourth proportional to 3,571.50, 4,928.64 and 1,978.20 is: 2,729.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,571.50 : 4,928.64 = 1,978.20 : x
  2. Step 2: Convert to fraction form
    3,571.50/4,928.64 = 1,978.20/x
  3. Step 3: Cross multiply
    3,571.50x = 4,928.64 × 1,978.20
  4. Step 4: Simplify right side
    3,571.50x = 9,749,835.65
  5. Step 5: Solve for x
    x = 9,749,835.65/3,571.50
  6. Step 6: Final answer
    x = 2,729.90

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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.