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Finding the Fourth Proportional to 7,201.80, 9,939.60 and 4,217.40

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Solution

The fourth proportional to 7,201.80, 9,939.60 and 4,217.40 is: 5,820.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,201.80 : 9,939.60 = 4,217.40 : x
  2. Step 2: Convert to fraction form
    7,201.80/9,939.60 = 4,217.40/x
  3. Step 3: Cross multiply
    7,201.80x = 9,939.60 × 4,217.40
  4. Step 4: Simplify right side
    7,201.80x = 41,919,269.04
  5. Step 5: Solve for x
    x = 41,919,269.04/7,201.80
  6. Step 6: Final answer
    x = 5,820.67

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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.