Home / 12,991.75-19,518.82-8,320.81

Finding the Fourth Proportional to 12,991.75, 19,518.82 and 8,320.81

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Solution

The fourth proportional to 12,991.75, 19,518.82 and 8,320.81 is: 12,501.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,991.75 : 19,518.82 = 8,320.81 : x
  2. Step 2: Convert to fraction form
    12,991.75/19,518.82 = 8,320.81/x
  3. Step 3: Cross multiply
    12,991.75x = 19,518.82 × 8,320.81
  4. Step 4: Simplify right side
    12,991.75x = 162,412,392.64
  5. Step 5: Solve for x
    x = 162,412,392.64/12,991.75
  6. Step 6: Final answer
    x = 12,501.19

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.