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Finding the Fourth Proportional to 689.74, 1,034.55 and 202.90

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Solution

The fourth proportional to 689.74, 1,034.55 and 202.90 is: 304.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.74 : 1,034.55 = 202.90 : x
  2. Step 2: Convert to fraction form
    689.74/1,034.55 = 202.90/x
  3. Step 3: Cross multiply
    689.74x = 1,034.55 × 202.90
  4. Step 4: Simplify right side
    689.74x = 209,910.20
  5. Step 5: Solve for x
    x = 209,910.20/689.74
  6. Step 6: Final answer
    x = 304.33

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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.