Home / 28,620.72-39,479.40-20,680.56

Finding the Fourth Proportional to 28,620.72, 39,479.40 and 20,680.56

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Solution

The fourth proportional to 28,620.72, 39,479.40 and 20,680.56 is: 28,526.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,620.72 : 39,479.40 = 20,680.56 : x
  2. Step 2: Convert to fraction form
    28,620.72/39,479.40 = 20,680.56/x
  3. Step 3: Cross multiply
    28,620.72x = 39,479.40 × 20,680.56
  4. Step 4: Simplify right side
    28,620.72x = 816,456,100.46
  5. Step 5: Solve for x
    x = 816,456,100.46/28,620.72
  6. Step 6: Final answer
    x = 28,526.75

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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.