Home / 3,971.79-5,479.96-3,129.88

Finding the Fourth Proportional to 3,971.79, 5,479.96 and 3,129.88

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Solution

The fourth proportional to 3,971.79, 5,479.96 and 3,129.88 is: 4,318.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,971.79 : 5,479.96 = 3,129.88 : x
  2. Step 2: Convert to fraction form
    3,971.79/5,479.96 = 3,129.88/x
  3. Step 3: Cross multiply
    3,971.79x = 5,479.96 × 3,129.88
  4. Step 4: Simplify right side
    3,971.79x = 17,151,630.90
  5. Step 5: Solve for x
    x = 17,151,630.90/3,971.79
  6. Step 6: Final answer
    x = 4,318.36

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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.