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Finding the Fourth Proportional to 15,681.63, 21,640.74 and 8,608.05

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Solution

The fourth proportional to 15,681.63, 21,640.74 and 8,608.05 is: 11,879.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,681.63 : 21,640.74 = 8,608.05 : x
  2. Step 2: Convert to fraction form
    15,681.63/21,640.74 = 8,608.05/x
  3. Step 3: Cross multiply
    15,681.63x = 21,640.74 × 8,608.05
  4. Step 4: Simplify right side
    15,681.63x = 186,284,571.96
  5. Step 5: Solve for x
    x = 186,284,571.96/15,681.63
  6. Step 6: Final answer
    x = 11,879.16

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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.