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Finding the Fourth Proportional to 4,312.80, 6,463.80 and 2,116.80

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Solution

The fourth proportional to 4,312.80, 6,463.80 and 2,116.80 is: 3,172.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,312.80 : 6,463.80 = 2,116.80 : x
  2. Step 2: Convert to fraction form
    4,312.80/6,463.80 = 2,116.80/x
  3. Step 3: Cross multiply
    4,312.80x = 6,463.80 × 2,116.80
  4. Step 4: Simplify right side
    4,312.80x = 13,682,571.84
  5. Step 5: Solve for x
    x = 13,682,571.84/4,312.80
  6. Step 6: Final answer
    x = 3,172.55

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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.