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Finding the Fourth Proportional to 18,791.65, 28,190.72 and 6,312.88

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Solution

The fourth proportional to 18,791.65, 28,190.72 and 6,312.88 is: 9,470.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,791.65 : 28,190.72 = 6,312.88 : x
  2. Step 2: Convert to fraction form
    18,791.65/28,190.72 = 6,312.88/x
  3. Step 3: Cross multiply
    18,791.65x = 28,190.72 × 6,312.88
  4. Step 4: Simplify right side
    18,791.65x = 177,964,632.47
  5. Step 5: Solve for x
    x = 177,964,632.47/18,791.65
  6. Step 6: Final answer
    x = 9,470.41

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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.