Home / 28,440.65-42,684.21-20,128.73

Finding the Fourth Proportional to 28,440.65, 42,684.21 and 20,128.73

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Solution

The fourth proportional to 28,440.65, 42,684.21 and 20,128.73 is: 30,209.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,440.65 : 42,684.21 = 20,128.73 : x
  2. Step 2: Convert to fraction form
    28,440.65/42,684.21 = 20,128.73/x
  3. Step 3: Cross multiply
    28,440.65x = 42,684.21 × 20,128.73
  4. Step 4: Simplify right side
    28,440.65x = 859,178,724.93
  5. Step 5: Solve for x
    x = 859,178,724.93/28,440.65
  6. Step 6: Final answer
    x = 30,209.53

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1.5x scale

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.