Home / 9,990.12-13,771.26-8,218.62

Finding the Fourth Proportional to 9,990.12, 13,771.26 and 8,218.62

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Solution

The fourth proportional to 9,990.12, 13,771.26 and 8,218.62 is: 11,329.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,990.12 : 13,771.26 = 8,218.62 : x
  2. Step 2: Convert to fraction form
    9,990.12/13,771.26 = 8,218.62/x
  3. Step 3: Cross multiply
    9,990.12x = 13,771.26 × 8,218.62
  4. Step 4: Simplify right side
    9,990.12x = 113,180,752.86
  5. Step 5: Solve for x
    x = 113,180,752.86/9,990.12
  6. Step 6: Final answer
    x = 11,329.27

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Half scale
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Double scale
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Similar ratio
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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.