Home / 3,128.20-4,313.98-2,289.62

Finding the Fourth Proportional to 3,128.20, 4,313.98 and 2,289.62

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Solution

The fourth proportional to 3,128.20, 4,313.98 and 2,289.62 is: 3,157.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,128.20 : 4,313.98 = 2,289.62 : x
  2. Step 2: Convert to fraction form
    3,128.20/4,313.98 = 2,289.62/x
  3. Step 3: Cross multiply
    3,128.20x = 4,313.98 × 2,289.62
  4. Step 4: Simplify right side
    3,128.20x = 9,877,379.95
  5. Step 5: Solve for x
    x = 9,877,379.95/3,128.20
  6. Step 6: Final answer
    x = 3,157.53

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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.