Home / 13,212.99-18,231.08-7,620.75

Finding the Fourth Proportional to 13,212.99, 18,231.08 and 7,620.75

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Solution

The fourth proportional to 13,212.99, 18,231.08 and 7,620.75 is: 10,514.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,212.99 : 18,231.08 = 7,620.75 : x
  2. Step 2: Convert to fraction form
    13,212.99/18,231.08 = 7,620.75/x
  3. Step 3: Cross multiply
    13,212.99x = 18,231.08 × 7,620.75
  4. Step 4: Simplify right side
    13,212.99x = 138,934,464.81
  5. Step 5: Solve for x
    x = 138,934,464.81/13,212.99
  6. Step 6: Final answer
    x = 10,514.99

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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.