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Finding the Fourth Proportional to 3,918.86, 5,408.03 and 2,240.31

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Solution

The fourth proportional to 3,918.86, 5,408.03 and 2,240.31 is: 3,091.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,918.86 : 5,408.03 = 2,240.31 : x
  2. Step 2: Convert to fraction form
    3,918.86/5,408.03 = 2,240.31/x
  3. Step 3: Cross multiply
    3,918.86x = 5,408.03 × 2,240.31
  4. Step 4: Simplify right side
    3,918.86x = 12,115,637.81
  5. Step 5: Solve for x
    x = 12,115,637.81/3,918.86
  6. Step 6: Final answer
    x = 3,091.62

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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.