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Finding the Fourth Proportional to 3,651.76, 5,479.80 and 1,920.52

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Solution

The fourth proportional to 3,651.76, 5,479.80 and 1,920.52 is: 2,881.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,651.76 : 5,479.80 = 1,920.52 : x
  2. Step 2: Convert to fraction form
    3,651.76/5,479.80 = 1,920.52/x
  3. Step 3: Cross multiply
    3,651.76x = 5,479.80 × 1,920.52
  4. Step 4: Simplify right side
    3,651.76x = 10,524,065.50
  5. Step 5: Solve for x
    x = 10,524,065.50/3,651.76
  6. Step 6: Final answer
    x = 2,881.92

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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.