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Finding the Fourth Proportional to 3,421.70, 5,125.80 and 3,015.80

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Solution

The fourth proportional to 3,421.70, 5,125.80 and 3,015.80 is: 4,517.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,421.70 : 5,125.80 = 3,015.80 : x
  2. Step 2: Convert to fraction form
    3,421.70/5,125.80 = 3,015.80/x
  3. Step 3: Cross multiply
    3,421.70x = 5,125.80 × 3,015.80
  4. Step 4: Simplify right side
    3,421.70x = 15,458,387.64
  5. Step 5: Solve for x
    x = 15,458,387.64/3,421.70
  6. Step 6: Final answer
    x = 4,517.75

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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.