Home / 3,945.90-5,428.57-3,836.55

Finding the Fourth Proportional to 3,945.90, 5,428.57 and 3,836.55

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Solution

The fourth proportional to 3,945.90, 5,428.57 and 3,836.55 is: 5,278.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,945.90 : 5,428.57 = 3,836.55 : x
  2. Step 2: Convert to fraction form
    3,945.90/5,428.57 = 3,836.55/x
  3. Step 3: Cross multiply
    3,945.90x = 5,428.57 × 3,836.55
  4. Step 4: Simplify right side
    3,945.90x = 20,826,980.23
  5. Step 5: Solve for x
    x = 20,826,980.23/3,945.90
  6. Step 6: Final answer
    x = 5,278.13

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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.