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Finding the Fourth Proportional to 3,290.88, 4,930.56 and 1,920

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Solution

The fourth proportional to 3,290.88, 4,930.56 and 1,920 is: 2,876.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,290.88 : 4,930.56 = 1,920 : x
  2. Step 2: Convert to fraction form
    3,290.88/4,930.56 = 1,920/x
  3. Step 3: Cross multiply
    3,290.88x = 4,930.56 × 1,920
  4. Step 4: Simplify right side
    3,290.88x = 9,466,675.20
  5. Step 5: Solve for x
    x = 9,466,675.20/3,290.88
  6. Step 6: Final answer
    x = 2,876.64

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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.