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Finding the Fourth Proportional to 3,919.62, 5,409.16 and 2,151.22

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Solution

The fourth proportional to 3,919.62, 5,409.16 and 2,151.22 is: 2,968.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,919.62 : 5,409.16 = 2,151.22 : x
  2. Step 2: Convert to fraction form
    3,919.62/5,409.16 = 2,151.22/x
  3. Step 3: Cross multiply
    3,919.62x = 5,409.16 × 2,151.22
  4. Step 4: Simplify right side
    3,919.62x = 11,636,298.55
  5. Step 5: Solve for x
    x = 11,636,298.55/3,919.62
  6. Step 6: Final answer
    x = 2,968.74

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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.