Home / 3,932.81-5,421.85-3,138.81

Finding the Fourth Proportional to 3,932.81, 5,421.85 and 3,138.81

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Solution

The fourth proportional to 3,932.81, 5,421.85 and 3,138.81 is: 4,327.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,932.81 : 5,421.85 = 3,138.81 : x
  2. Step 2: Convert to fraction form
    3,932.81/5,421.85 = 3,138.81/x
  3. Step 3: Cross multiply
    3,932.81x = 5,421.85 × 3,138.81
  4. Step 4: Simplify right side
    3,932.81x = 17,018,157.00
  5. Step 5: Solve for x
    x = 17,018,157.00/3,932.81
  6. Step 6: Final answer
    x = 4,327.23

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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.