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Finding the Fourth Proportional to 3,998.76, 5,518.24 and 2,230.40

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Solution

The fourth proportional to 3,998.76, 5,518.24 and 2,230.40 is: 3,077.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,998.76 : 5,518.24 = 2,230.40 : x
  2. Step 2: Convert to fraction form
    3,998.76/5,518.24 = 2,230.40/x
  3. Step 3: Cross multiply
    3,998.76x = 5,518.24 × 2,230.40
  4. Step 4: Simplify right side
    3,998.76x = 12,307,849.33
  5. Step 5: Solve for x
    x = 12,307,849.33/3,998.76
  6. Step 6: Final answer
    x = 3,077.92

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Half scale
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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.