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Finding the Fourth Proportional to 2,811.84, 3,880.34 and 1,616.91

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Solution

The fourth proportional to 2,811.84, 3,880.34 and 1,616.91 is: 2,231.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,811.84 : 3,880.34 = 1,616.91 : x
  2. Step 2: Convert to fraction form
    2,811.84/3,880.34 = 1,616.91/x
  3. Step 3: Cross multiply
    2,811.84x = 3,880.34 × 1,616.91
  4. Step 4: Simplify right side
    2,811.84x = 6,274,152.46
  5. Step 5: Solve for x
    x = 6,274,152.46/2,811.84
  6. Step 6: Final answer
    x = 2,231.33

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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.