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Finding the Fourth Proportional to 12,976.40, 17,896.40 and 10,969.60

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Solution

The fourth proportional to 12,976.40, 17,896.40 and 10,969.60 is: 15,128.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,976.40 : 17,896.40 = 10,969.60 : x
  2. Step 2: Convert to fraction form
    12,976.40/17,896.40 = 10,969.60/x
  3. Step 3: Cross multiply
    12,976.40x = 17,896.40 × 10,969.60
  4. Step 4: Simplify right side
    12,976.40x = 196,316,349.44
  5. Step 5: Solve for x
    x = 196,316,349.44/12,976.40
  6. Step 6: Final answer
    x = 15,128.72

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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.