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Finding the Fourth Proportional to 1,328.88, 1,989 and 1,220.40

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Solution

The fourth proportional to 1,328.88, 1,989 and 1,220.40 is: 1,826.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.88 : 1,989 = 1,220.40 : x
  2. Step 2: Convert to fraction form
    1,328.88/1,989 = 1,220.40/x
  3. Step 3: Cross multiply
    1,328.88x = 1,989 × 1,220.40
  4. Step 4: Simplify right side
    1,328.88x = 2,427,375.60
  5. Step 5: Solve for x
    x = 2,427,375.60/1,328.88
  6. Step 6: Final answer
    x = 1,826.63

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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.