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Finding the Fourth Proportional to 13,759.80, 20,631.60 and 4,990.80

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Solution

The fourth proportional to 13,759.80, 20,631.60 and 4,990.80 is: 7,483.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,759.80 : 20,631.60 = 4,990.80 : x
  2. Step 2: Convert to fraction form
    13,759.80/20,631.60 = 4,990.80/x
  3. Step 3: Cross multiply
    13,759.80x = 20,631.60 × 4,990.80
  4. Step 4: Simplify right side
    13,759.80x = 102,968,189.28
  5. Step 5: Solve for x
    x = 102,968,189.28/13,759.80
  6. Step 6: Final answer
    x = 7,483.26

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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.