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Finding the Fourth Proportional to 2,218.88, 3,328.64 and 680

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Solution

The fourth proportional to 2,218.88, 3,328.64 and 680 is: 1,020.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,218.88 : 3,328.64 = 680 : x
  2. Step 2: Convert to fraction form
    2,218.88/3,328.64 = 680/x
  3. Step 3: Cross multiply
    2,218.88x = 3,328.64 × 680
  4. Step 4: Simplify right side
    2,218.88x = 2,263,475.20
  5. Step 5: Solve for x
    x = 2,263,475.20/2,218.88
  6. Step 6: Final answer
    x = 1,020.10

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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.