Home / 28,976-39,986.88-15,728

Finding the Fourth Proportional to 28,976, 39,986.88 and 15,728

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Solution

The fourth proportional to 28,976, 39,986.88 and 15,728 is: 21,704.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,976 : 39,986.88 = 15,728 : x
  2. Step 2: Convert to fraction form
    28,976/39,986.88 = 15,728/x
  3. Step 3: Cross multiply
    28,976x = 39,986.88 × 15,728
  4. Step 4: Simplify right side
    28,976x = 628,913,648.64
  5. Step 5: Solve for x
    x = 628,913,648.64/28,976
  6. Step 6: Final answer
    x = 21,704.64

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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.