Home / 13,218.99-18,237.21-8,439.12

Finding the Fourth Proportional to 13,218.99, 18,237.21 and 8,439.12

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Solution

The fourth proportional to 13,218.99, 18,237.21 and 8,439.12 is: 11,642.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,218.99 : 18,237.21 = 8,439.12 : x
  2. Step 2: Convert to fraction form
    13,218.99/18,237.21 = 8,439.12/x
  3. Step 3: Cross multiply
    13,218.99x = 18,237.21 × 8,439.12
  4. Step 4: Simplify right side
    13,218.99x = 153,906,003.66
  5. Step 5: Solve for x
    x = 153,906,003.66/13,218.99
  6. Step 6: Final answer
    x = 11,642.80

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Double scale
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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.