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Finding the Fourth Proportional to 680.89, 1,020.82 and 436.94

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Solution

The fourth proportional to 680.89, 1,020.82 and 436.94 is: 655.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.89 : 1,020.82 = 436.94 : x
  2. Step 2: Convert to fraction form
    680.89/1,020.82 = 436.94/x
  3. Step 3: Cross multiply
    680.89x = 1,020.82 × 436.94
  4. Step 4: Simplify right side
    680.89x = 446,037.09
  5. Step 5: Solve for x
    x = 446,037.09/680.89
  6. Step 6: Final answer
    x = 655.08

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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.