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Finding the Fourth Proportional to 3,245.64, 4,479.12 and 1,920.12

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Solution

The fourth proportional to 3,245.64, 4,479.12 and 1,920.12 is: 2,649.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,245.64 : 4,479.12 = 1,920.12 : x
  2. Step 2: Convert to fraction form
    3,245.64/4,479.12 = 1,920.12/x
  3. Step 3: Cross multiply
    3,245.64x = 4,479.12 × 1,920.12
  4. Step 4: Simplify right side
    3,245.64x = 8,600,447.89
  5. Step 5: Solve for x
    x = 8,600,447.89/3,245.64
  6. Step 6: Final answer
    x = 2,649.85

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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.