Home / 3,420.40-5,130.60-2,189.20

Finding the Fourth Proportional to 3,420.40, 5,130.60 and 2,189.20

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Solution

The fourth proportional to 3,420.40, 5,130.60 and 2,189.20 is: 3,283.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,420.40 : 5,130.60 = 2,189.20 : x
  2. Step 2: Convert to fraction form
    3,420.40/5,130.60 = 2,189.20/x
  3. Step 3: Cross multiply
    3,420.40x = 5,130.60 × 2,189.20
  4. Step 4: Simplify right side
    3,420.40x = 11,231,909.52
  5. Step 5: Solve for x
    x = 11,231,909.52/3,420.40
  6. Step 6: Final answer
    x = 3,283.80

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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.