Home / 3,830.40-5,285.79-2,151.90

Finding the Fourth Proportional to 3,830.40, 5,285.79 and 2,151.90

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Solution

The fourth proportional to 3,830.40, 5,285.79 and 2,151.90 is: 2,969.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,830.40 : 5,285.79 = 2,151.90 : x
  2. Step 2: Convert to fraction form
    3,830.40/5,285.79 = 2,151.90/x
  3. Step 3: Cross multiply
    3,830.40x = 5,285.79 × 2,151.90
  4. Step 4: Simplify right side
    3,830.40x = 11,374,491.50
  5. Step 5: Solve for x
    x = 11,374,491.50/3,830.40
  6. Step 6: Final answer
    x = 2,969.53

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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.