Home / 5,215.20-7,812.72-3,480

Finding the Fourth Proportional to 5,215.20, 7,812.72 and 3,480

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Solution

The fourth proportional to 5,215.20, 7,812.72 and 3,480 is: 5,213.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,215.20 : 7,812.72 = 3,480 : x
  2. Step 2: Convert to fraction form
    5,215.20/7,812.72 = 3,480/x
  3. Step 3: Cross multiply
    5,215.20x = 7,812.72 × 3,480
  4. Step 4: Simplify right side
    5,215.20x = 27,188,265.60
  5. Step 5: Solve for x
    x = 27,188,265.60/5,215.20
  6. Step 6: Final answer
    x = 5,213.27

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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.