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Finding the Fourth Proportional to 3,992.80, 5,509.14 and 2,420.56

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Solution

The fourth proportional to 3,992.80, 5,509.14 and 2,420.56 is: 3,339.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,992.80 : 5,509.14 = 2,420.56 : x
  2. Step 2: Convert to fraction form
    3,992.80/5,509.14 = 2,420.56/x
  3. Step 3: Cross multiply
    3,992.80x = 5,509.14 × 2,420.56
  4. Step 4: Simplify right side
    3,992.80x = 13,335,203.92
  5. Step 5: Solve for x
    x = 13,335,203.92/3,992.80
  6. Step 6: Final answer
    x = 3,339.81

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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.