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Finding the Fourth Proportional to 1,680.72, 2,519.60 and 654

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Solution

The fourth proportional to 1,680.72, 2,519.60 and 654 is: 980.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,680.72 : 2,519.60 = 654 : x
  2. Step 2: Convert to fraction form
    1,680.72/2,519.60 = 654/x
  3. Step 3: Cross multiply
    1,680.72x = 2,519.60 × 654
  4. Step 4: Simplify right side
    1,680.72x = 1,647,818.40
  5. Step 5: Solve for x
    x = 1,647,818.40/1,680.72
  6. Step 6: Final answer
    x = 980.42

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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.