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Finding the Fourth Proportional to 12,939.40, 17,857.86 and 7,197.43

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Solution

The fourth proportional to 12,939.40, 17,857.86 and 7,197.43 is: 9,933.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,939.40 : 17,857.86 = 7,197.43 : x
  2. Step 2: Convert to fraction form
    12,939.40/17,857.86 = 7,197.43/x
  3. Step 3: Cross multiply
    12,939.40x = 17,857.86 × 7,197.43
  4. Step 4: Simplify right side
    12,939.40x = 128,530,670.65
  5. Step 5: Solve for x
    x = 128,530,670.65/12,939.40
  6. Step 6: Final answer
    x = 9,933.28

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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.