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Finding the Fourth Proportional to 3,915.60, 5,862.60 and 3,721.20

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Solution

The fourth proportional to 3,915.60, 5,862.60 and 3,721.20 is: 5,571.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,915.60 : 5,862.60 = 3,721.20 : x
  2. Step 2: Convert to fraction form
    3,915.60/5,862.60 = 3,721.20/x
  3. Step 3: Cross multiply
    3,915.60x = 5,862.60 × 3,721.20
  4. Step 4: Simplify right side
    3,915.60x = 21,815,907.12
  5. Step 5: Solve for x
    x = 21,815,907.12/3,915.60
  6. Step 6: Final answer
    x = 5,571.54

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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.