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Finding the Fourth Proportional to 12,907.80, 17,812.97 and 7,243.80

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Solution

The fourth proportional to 12,907.80, 17,812.97 and 7,243.80 is: 9,996.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,907.80 : 17,812.97 = 7,243.80 : x
  2. Step 2: Convert to fraction form
    12,907.80/17,812.97 = 7,243.80/x
  3. Step 3: Cross multiply
    12,907.80x = 17,812.97 × 7,243.80
  4. Step 4: Simplify right side
    12,907.80x = 129,033,555.87
  5. Step 5: Solve for x
    x = 129,033,555.87/12,907.80
  6. Step 6: Final answer
    x = 9,996.56

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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.