Home / 3,420.89-5,135.58-3,405.09

Finding the Fourth Proportional to 3,420.89, 5,135.58 and 3,405.09

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Solution

The fourth proportional to 3,420.89, 5,135.58 and 3,405.09 is: 5,111.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,420.89 : 5,135.58 = 3,405.09 : x
  2. Step 2: Convert to fraction form
    3,420.89/5,135.58 = 3,405.09/x
  3. Step 3: Cross multiply
    3,420.89x = 5,135.58 × 3,405.09
  4. Step 4: Simplify right side
    3,420.89x = 17,487,112.10
  5. Step 5: Solve for x
    x = 17,487,112.10/3,420.89
  6. Step 6: Final answer
    x = 5,111.87

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.