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Finding the Fourth Proportional to 28,608.12, 42,912.18 and 11,976.12

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Solution

The fourth proportional to 28,608.12, 42,912.18 and 11,976.12 is: 17,964.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,608.12 : 42,912.18 = 11,976.12 : x
  2. Step 2: Convert to fraction form
    28,608.12/42,912.18 = 11,976.12/x
  3. Step 3: Cross multiply
    28,608.12x = 42,912.18 × 11,976.12
  4. Step 4: Simplify right side
    28,608.12x = 513,921,417.14
  5. Step 5: Solve for x
    x = 513,921,417.14/28,608.12
  6. Step 6: Final answer
    x = 17,964.18

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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.