Home / 5,429.85-8,147.40-2,145.70

Finding the Fourth Proportional to 5,429.85, 8,147.40 and 2,145.70

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Solution

The fourth proportional to 5,429.85, 8,147.40 and 2,145.70 is: 3,219.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,429.85 : 8,147.40 = 2,145.70 : x
  2. Step 2: Convert to fraction form
    5,429.85/8,147.40 = 2,145.70/x
  3. Step 3: Cross multiply
    5,429.85x = 8,147.40 × 2,145.70
  4. Step 4: Simplify right side
    5,429.85x = 17,481,876.18
  5. Step 5: Solve for x
    x = 17,481,876.18/5,429.85
  6. Step 6: Final answer
    x = 3,219.59

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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.