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Finding the Fourth Proportional to 3,571.36, 4,928.80 and 1,978.16

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Solution

The fourth proportional to 3,571.36, 4,928.80 and 1,978.16 is: 2,730.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,571.36 : 4,928.80 = 1,978.16 : x
  2. Step 2: Convert to fraction form
    3,571.36/4,928.80 = 1,978.16/x
  3. Step 3: Cross multiply
    3,571.36x = 4,928.80 × 1,978.16
  4. Step 4: Simplify right side
    3,571.36x = 9,749,955.01
  5. Step 5: Solve for x
    x = 9,749,955.01/3,571.36
  6. Step 6: Final answer
    x = 2,730.04

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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.