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Finding the Fourth Proportional to 5,460.80, 8,188.80 and 2,172.80

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Solution

The fourth proportional to 5,460.80, 8,188.80 and 2,172.80 is: 3,258.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,460.80 : 8,188.80 = 2,172.80 : x
  2. Step 2: Convert to fraction form
    5,460.80/8,188.80 = 2,172.80/x
  3. Step 3: Cross multiply
    5,460.80x = 8,188.80 × 2,172.80
  4. Step 4: Simplify right side
    5,460.80x = 17,792,624.64
  5. Step 5: Solve for x
    x = 17,792,624.64/5,460.80
  6. Step 6: Final answer
    x = 3,258.25

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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.