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Finding the Fourth Proportional to 5,486.68, 7,571.42 and 3,128.38

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Solution

The fourth proportional to 5,486.68, 7,571.42 and 3,128.38 is: 4,317.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,486.68 : 7,571.42 = 3,128.38 : x
  2. Step 2: Convert to fraction form
    5,486.68/7,571.42 = 3,128.38/x
  3. Step 3: Cross multiply
    5,486.68x = 7,571.42 × 3,128.38
  4. Step 4: Simplify right side
    5,486.68x = 23,686,278.90
  5. Step 5: Solve for x
    x = 23,686,278.90/5,486.68
  6. Step 6: Final answer
    x = 4,317.05

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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.