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Finding the Fourth Proportional to 12,979.10, 17,910.79 and 7,313.75

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Solution

The fourth proportional to 12,979.10, 17,910.79 and 7,313.75 is: 10,092.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,979.10 : 17,910.79 = 7,313.75 : x
  2. Step 2: Convert to fraction form
    12,979.10/17,910.79 = 7,313.75/x
  3. Step 3: Cross multiply
    12,979.10x = 17,910.79 × 7,313.75
  4. Step 4: Simplify right side
    12,979.10x = 130,994,914.24
  5. Step 5: Solve for x
    x = 130,994,914.24/12,979.10
  6. Step 6: Final answer
    x = 10,092.76

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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.