Home / 5,428.88-8,121.80-3,420.60

Finding the Fourth Proportional to 5,428.88, 8,121.80 and 3,420.60

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Solution

The fourth proportional to 5,428.88, 8,121.80 and 3,420.60 is: 5,117.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,428.88 : 8,121.80 = 3,420.60 : x
  2. Step 2: Convert to fraction form
    5,428.88/8,121.80 = 3,420.60/x
  3. Step 3: Cross multiply
    5,428.88x = 8,121.80 × 3,420.60
  4. Step 4: Simplify right side
    5,428.88x = 27,781,437.63
  5. Step 5: Solve for x
    x = 27,781,437.63/5,428.88
  6. Step 6: Final answer
    x = 5,117.34

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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.