Home / 3,930.91-5,421.63-2,868.51

Finding the Fourth Proportional to 3,930.91, 5,421.63 and 2,868.51

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Solution

The fourth proportional to 3,930.91, 5,421.63 and 2,868.51 is: 3,956.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,930.91 : 5,421.63 = 2,868.51 : x
  2. Step 2: Convert to fraction form
    3,930.91/5,421.63 = 2,868.51/x
  3. Step 3: Cross multiply
    3,930.91x = 5,421.63 × 2,868.51
  4. Step 4: Simplify right side
    3,930.91x = 15,551,999.87
  5. Step 5: Solve for x
    x = 15,551,999.87/3,930.91
  6. Step 6: Final answer
    x = 3,956.34

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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.