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Finding the Fourth Proportional to 15,696.65, 21,661.25 and 8,623.10

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Solution

The fourth proportional to 15,696.65, 21,661.25 and 8,623.10 is: 11,899.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,696.65 : 21,661.25 = 8,623.10 : x
  2. Step 2: Convert to fraction form
    15,696.65/21,661.25 = 8,623.10/x
  3. Step 3: Cross multiply
    15,696.65x = 21,661.25 × 8,623.10
  4. Step 4: Simplify right side
    15,696.65x = 186,786,973.45
  5. Step 5: Solve for x
    x = 186,786,973.45/15,696.65
  6. Step 6: Final answer
    x = 11,899.80

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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.