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Finding the Fourth Proportional to 3,391.64, 4,680.80 and 1,899.68

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Solution

The fourth proportional to 3,391.64, 4,680.80 and 1,899.68 is: 2,621.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,391.64 : 4,680.80 = 1,899.68 : x
  2. Step 2: Convert to fraction form
    3,391.64/4,680.80 = 1,899.68/x
  3. Step 3: Cross multiply
    3,391.64x = 4,680.80 × 1,899.68
  4. Step 4: Simplify right side
    3,391.64x = 8,892,022.14
  5. Step 5: Solve for x
    x = 8,892,022.14/3,391.64
  6. Step 6: Final answer
    x = 2,621.75

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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.