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Finding the Fourth Proportional to 689.73, 1,034.69 and 202.78

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Solution

The fourth proportional to 689.73, 1,034.69 and 202.78 is: 304.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.73 : 1,034.69 = 202.78 : x
  2. Step 2: Convert to fraction form
    689.73/1,034.69 = 202.78/x
  3. Step 3: Cross multiply
    689.73x = 1,034.69 × 202.78
  4. Step 4: Simplify right side
    689.73x = 209,814.44
  5. Step 5: Solve for x
    x = 209,814.44/689.73
  6. Step 6: Final answer
    x = 304.20

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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.