Home / 3,935.21-5,430.57-2,166.78

Finding the Fourth Proportional to 3,935.21, 5,430.57 and 2,166.78

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Solution

The fourth proportional to 3,935.21, 5,430.57 and 2,166.78 is: 2,990.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,935.21 : 5,430.57 = 2,166.78 : x
  2. Step 2: Convert to fraction form
    3,935.21/5,430.57 = 2,166.78/x
  3. Step 3: Cross multiply
    3,935.21x = 5,430.57 × 2,166.78
  4. Step 4: Simplify right side
    3,935.21x = 11,766,850.46
  5. Step 5: Solve for x
    x = 11,766,850.46/3,935.21
  6. Step 6: Final answer
    x = 2,990.15

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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.