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Finding the Fourth Proportional to 5,708.70, 7,884.19 and 3,920.88

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Solution

The fourth proportional to 5,708.70, 7,884.19 and 3,920.88 is: 5,415.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,708.70 : 7,884.19 = 3,920.88 : x
  2. Step 2: Convert to fraction form
    5,708.70/7,884.19 = 3,920.88/x
  3. Step 3: Cross multiply
    5,708.70x = 7,884.19 × 3,920.88
  4. Step 4: Simplify right side
    5,708.70x = 30,912,997.35
  5. Step 5: Solve for x
    x = 30,912,997.35/5,708.70
  6. Step 6: Final answer
    x = 5,415.07

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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.