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Finding the Fourth Proportional to 7,021.80, 9,690.72 and 3,879

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Solution

The fourth proportional to 7,021.80, 9,690.72 and 3,879 is: 5,353.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,021.80 : 9,690.72 = 3,879 : x
  2. Step 2: Convert to fraction form
    7,021.80/9,690.72 = 3,879/x
  3. Step 3: Cross multiply
    7,021.80x = 9,690.72 × 3,879
  4. Step 4: Simplify right side
    7,021.80x = 37,590,302.88
  5. Step 5: Solve for x
    x = 37,590,302.88/7,021.80
  6. Step 6: Final answer
    x = 5,353.37

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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.