Home / 5,120.05-7,061.88-3,128.97

Finding the Fourth Proportional to 5,120.05, 7,061.88 and 3,128.97

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Solution

The fourth proportional to 5,120.05, 7,061.88 and 3,128.97 is: 4,315.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,120.05 : 7,061.88 = 3,128.97 : x
  2. Step 2: Convert to fraction form
    5,120.05/7,061.88 = 3,128.97/x
  3. Step 3: Cross multiply
    5,120.05x = 7,061.88 × 3,128.97
  4. Step 4: Simplify right side
    5,120.05x = 22,096,410.66
  5. Step 5: Solve for x
    x = 22,096,410.66/5,120.05
  6. Step 6: Final answer
    x = 4,315.66

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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.