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Finding the Fourth Proportional to 5,739.78, 7,920.90 and 3,221.89

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Solution

The fourth proportional to 5,739.78, 7,920.90 and 3,221.89 is: 4,446.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,739.78 : 7,920.90 = 3,221.89 : x
  2. Step 2: Convert to fraction form
    5,739.78/7,920.90 = 3,221.89/x
  3. Step 3: Cross multiply
    5,739.78x = 7,920.90 × 3,221.89
  4. Step 4: Simplify right side
    5,739.78x = 25,520,268.50
  5. Step 5: Solve for x
    x = 25,520,268.50/5,739.78
  6. Step 6: Final answer
    x = 4,446.21

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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.