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Finding the Fourth Proportional to 15,012.56, 20,718.12 and 8,640.12

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Solution

The fourth proportional to 15,012.56, 20,718.12 and 8,640.12 is: 11,923.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,012.56 : 20,718.12 = 8,640.12 : x
  2. Step 2: Convert to fraction form
    15,012.56/20,718.12 = 8,640.12/x
  3. Step 3: Cross multiply
    15,012.56x = 20,718.12 × 8,640.12
  4. Step 4: Simplify right side
    15,012.56x = 179,007,042.97
  5. Step 5: Solve for x
    x = 179,007,042.97/15,012.56
  6. Step 6: Final answer
    x = 11,923.82

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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.