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Finding the Fourth Proportional to 12,999, 17,938.86 and 9,279.48

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Solution

The fourth proportional to 12,999, 17,938.86 and 9,279.48 is: 12,805.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,999 : 17,938.86 = 9,279.48 : x
  2. Step 2: Convert to fraction form
    12,999/17,938.86 = 9,279.48/x
  3. Step 3: Cross multiply
    12,999x = 17,938.86 × 9,279.48
  4. Step 4: Simplify right side
    12,999x = 166,463,292.59
  5. Step 5: Solve for x
    x = 166,463,292.59/12,999
  6. Step 6: Final answer
    x = 12,805.85

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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.