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Finding the Fourth Proportional to 12,805.65, 17,672.97 and 7,771.16

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Solution

The fourth proportional to 12,805.65, 17,672.97 and 7,771.16 is: 10,724.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,805.65 : 17,672.97 = 7,771.16 : x
  2. Step 2: Convert to fraction form
    12,805.65/17,672.97 = 7,771.16/x
  3. Step 3: Cross multiply
    12,805.65x = 17,672.97 × 7,771.16
  4. Step 4: Simplify right side
    12,805.65x = 137,339,389.18
  5. Step 5: Solve for x
    x = 137,339,389.18/12,805.65
  6. Step 6: Final answer
    x = 10,724.90

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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.