Home / 3,111.08-4,665.96-919.20

Finding the Fourth Proportional to 3,111.08, 4,665.96 and 919.20

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Solution

The fourth proportional to 3,111.08, 4,665.96 and 919.20 is: 1,378.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,111.08 : 4,665.96 = 919.20 : x
  2. Step 2: Convert to fraction form
    3,111.08/4,665.96 = 919.20/x
  3. Step 3: Cross multiply
    3,111.08x = 4,665.96 × 919.20
  4. Step 4: Simplify right side
    3,111.08x = 4,288,950.43
  5. Step 5: Solve for x
    x = 4,288,950.43/3,111.08
  6. Step 6: Final answer
    x = 1,378.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.