Home / 3,931.21-5,425.05-2,162.78

Finding the Fourth Proportional to 3,931.21, 5,425.05 and 2,162.78

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Solution

The fourth proportional to 3,931.21, 5,425.05 and 2,162.78 is: 2,984.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,931.21 : 5,425.05 = 2,162.78 : x
  2. Step 2: Convert to fraction form
    3,931.21/5,425.05 = 2,162.78/x
  3. Step 3: Cross multiply
    3,931.21x = 5,425.05 × 2,162.78
  4. Step 4: Simplify right side
    3,931.21x = 11,733,169.63
  5. Step 5: Solve for x
    x = 11,733,169.63/3,931.21
  6. Step 6: Final answer
    x = 2,984.62

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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.