Home / 5,739.40-7,920.78-3,221.75

Finding the Fourth Proportional to 5,739.40, 7,920.78 and 3,221.75

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Solution

The fourth proportional to 5,739.40, 7,920.78 and 3,221.75 is: 4,446.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,739.40 : 7,920.78 = 3,221.75 : x
  2. Step 2: Convert to fraction form
    5,739.40/7,920.78 = 3,221.75/x
  3. Step 3: Cross multiply
    5,739.40x = 7,920.78 × 3,221.75
  4. Step 4: Simplify right side
    5,739.40x = 25,518,792.77
  5. Step 5: Solve for x
    x = 25,518,792.77/5,739.40
  6. Step 6: Final answer
    x = 4,446.25

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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.