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Finding the Fourth Proportional to 13,975.20, 20,955.60 and 5,205.60

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Solution

The fourth proportional to 13,975.20, 20,955.60 and 5,205.60 is: 7,805.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,975.20 : 20,955.60 = 5,205.60 : x
  2. Step 2: Convert to fraction form
    13,975.20/20,955.60 = 5,205.60/x
  3. Step 3: Cross multiply
    13,975.20x = 20,955.60 × 5,205.60
  4. Step 4: Simplify right side
    13,975.20x = 109,086,471.36
  5. Step 5: Solve for x
    x = 109,086,471.36/13,975.20
  6. Step 6: Final answer
    x = 7,805.72

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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.