Home / 5,515.20-7,611.36-3,420

Finding the Fourth Proportional to 5,515.20, 7,611.36 and 3,420

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Solution

The fourth proportional to 5,515.20, 7,611.36 and 3,420 is: 4,719.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,515.20 : 7,611.36 = 3,420 : x
  2. Step 2: Convert to fraction form
    5,515.20/7,611.36 = 3,420/x
  3. Step 3: Cross multiply
    5,515.20x = 7,611.36 × 3,420
  4. Step 4: Simplify right side
    5,515.20x = 26,030,851.20
  5. Step 5: Solve for x
    x = 26,030,851.20/5,515.20
  6. Step 6: Final answer
    x = 4,719.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.