Home / 5,120.80-7,065.76-2,881.86

Finding the Fourth Proportional to 5,120.80, 7,065.76 and 2,881.86

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Solution

The fourth proportional to 5,120.80, 7,065.76 and 2,881.86 is: 3,976.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,120.80 : 7,065.76 = 2,881.86 : x
  2. Step 2: Convert to fraction form
    5,120.80/7,065.76 = 2,881.86/x
  3. Step 3: Cross multiply
    5,120.80x = 7,065.76 × 2,881.86
  4. Step 4: Simplify right side
    5,120.80x = 20,362,531.11
  5. Step 5: Solve for x
    x = 20,362,531.11/5,120.80
  6. Step 6: Final answer
    x = 3,976.44

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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.