Home / 3,920.03-5,405.43-3,121.77

Finding the Fourth Proportional to 3,920.03, 5,405.43 and 3,121.77

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Solution

The fourth proportional to 3,920.03, 5,405.43 and 3,121.77 is: 4,304.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,920.03 : 5,405.43 = 3,121.77 : x
  2. Step 2: Convert to fraction form
    3,920.03/5,405.43 = 3,121.77/x
  3. Step 3: Cross multiply
    3,920.03x = 5,405.43 × 3,121.77
  4. Step 4: Simplify right side
    3,920.03x = 16,874,541.19
  5. Step 5: Solve for x
    x = 16,874,541.19/3,920.03
  6. Step 6: Final answer
    x = 4,304.70

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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.