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Finding the Fourth Proportional to 1,680.17, 2,520.26 and 813.88

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Solution

The fourth proportional to 1,680.17, 2,520.26 and 813.88 is: 1,220.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,680.17 : 2,520.26 = 813.88 : x
  2. Step 2: Convert to fraction form
    1,680.17/2,520.26 = 813.88/x
  3. Step 3: Cross multiply
    1,680.17x = 2,520.26 × 813.88
  4. Step 4: Simplify right side
    1,680.17x = 2,051,172.54
  5. Step 5: Solve for x
    x = 2,051,172.54/1,680.17
  6. Step 6: Final answer
    x = 1,220.81

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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.