Home / 28,968.76-39,976.88-15,720.76

Finding the Fourth Proportional to 28,968.76, 39,976.88 and 15,720.76

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Solution

The fourth proportional to 28,968.76, 39,976.88 and 15,720.76 is: 21,694.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,968.76 : 39,976.88 = 15,720.76 : x
  2. Step 2: Convert to fraction form
    28,968.76/39,976.88 = 15,720.76/x
  3. Step 3: Cross multiply
    28,968.76x = 39,976.88 × 15,720.76
  4. Step 4: Simplify right side
    28,968.76x = 628,466,936.03
  5. Step 5: Solve for x
    x = 628,466,936.03/28,968.76
  6. Step 6: Final answer
    x = 21,694.64

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1.5x scale

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.