Home / 3,938.90-5,435.72-2,170.51

Finding the Fourth Proportional to 3,938.90, 5,435.72 and 2,170.51

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Solution

The fourth proportional to 3,938.90, 5,435.72 and 2,170.51 is: 2,995.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,938.90 : 5,435.72 = 2,170.51 : x
  2. Step 2: Convert to fraction form
    3,938.90/5,435.72 = 2,170.51/x
  3. Step 3: Cross multiply
    3,938.90x = 5,435.72 × 2,170.51
  4. Step 4: Simplify right side
    3,938.90x = 11,798,284.62
  5. Step 5: Solve for x
    x = 11,798,284.62/3,938.90
  6. Step 6: Final answer
    x = 2,995.32

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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.