Home / 28,255.78-38,994.51-15,680.80

Finding the Fourth Proportional to 28,255.78, 38,994.51 and 15,680.80

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Solution

The fourth proportional to 28,255.78, 38,994.51 and 15,680.80 is: 21,640.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,255.78 : 38,994.51 = 15,680.80 : x
  2. Step 2: Convert to fraction form
    28,255.78/38,994.51 = 15,680.80/x
  3. Step 3: Cross multiply
    28,255.78x = 38,994.51 × 15,680.80
  4. Step 4: Simplify right side
    28,255.78x = 611,465,112.41
  5. Step 5: Solve for x
    x = 611,465,112.41/28,255.78
  6. Step 6: Final answer
    x = 21,640.36

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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.