Home / 4,120.07-5,686.17-3,990.87

Finding the Fourth Proportional to 4,120.07, 5,686.17 and 3,990.87

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Solution

The fourth proportional to 4,120.07, 5,686.17 and 3,990.87 is: 5,507.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,120.07 : 5,686.17 = 3,990.87 : x
  2. Step 2: Convert to fraction form
    4,120.07/5,686.17 = 3,990.87/x
  3. Step 3: Cross multiply
    4,120.07x = 5,686.17 × 3,990.87
  4. Step 4: Simplify right side
    4,120.07x = 22,692,750.30
  5. Step 5: Solve for x
    x = 22,692,750.30/4,120.07
  6. Step 6: Final answer
    x = 5,507.86

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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.