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Finding the Fourth Proportional to 12,980.66, 17,912.75 and 7,953.39

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Solution

The fourth proportional to 12,980.66, 17,912.75 and 7,953.39 is: 10,975.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,980.66 : 17,912.75 = 7,953.39 : x
  2. Step 2: Convert to fraction form
    12,980.66/17,912.75 = 7,953.39/x
  3. Step 3: Cross multiply
    12,980.66x = 17,912.75 × 7,953.39
  4. Step 4: Simplify right side
    12,980.66x = 142,467,046.96
  5. Step 5: Solve for x
    x = 142,467,046.96/12,980.66
  6. Step 6: Final answer
    x = 10,975.34

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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.