Home / 5,128.85-7,078.34-3,140.73

Finding the Fourth Proportional to 5,128.85, 7,078.34 and 3,140.73

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Solution

The fourth proportional to 5,128.85, 7,078.34 and 3,140.73 is: 4,334.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,128.85 : 7,078.34 = 3,140.73 : x
  2. Step 2: Convert to fraction form
    5,128.85/7,078.34 = 3,140.73/x
  3. Step 3: Cross multiply
    5,128.85x = 7,078.34 × 3,140.73
  4. Step 4: Simplify right side
    5,128.85x = 22,231,154.79
  5. Step 5: Solve for x
    x = 22,231,154.79/5,128.85
  6. Step 6: Final answer
    x = 4,334.53

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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.