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Finding the Fourth Proportional to 5,323.60, 7,980.48 and 2,720.80

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Solution

The fourth proportional to 5,323.60, 7,980.48 and 2,720.80 is: 4,078.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,323.60 : 7,980.48 = 2,720.80 : x
  2. Step 2: Convert to fraction form
    5,323.60/7,980.48 = 2,720.80/x
  3. Step 3: Cross multiply
    5,323.60x = 7,980.48 × 2,720.80
  4. Step 4: Simplify right side
    5,323.60x = 21,713,289.98
  5. Step 5: Solve for x
    x = 21,713,289.98/5,323.60
  6. Step 6: Final answer
    x = 4,078.69

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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.