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Finding the Fourth Proportional to 1,072.72, 1,609.62 and 765.46

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Solution

The fourth proportional to 1,072.72, 1,609.62 and 765.46 is: 1,148.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.72 : 1,609.62 = 765.46 : x
  2. Step 2: Convert to fraction form
    1,072.72/1,609.62 = 765.46/x
  3. Step 3: Cross multiply
    1,072.72x = 1,609.62 × 765.46
  4. Step 4: Simplify right side
    1,072.72x = 1,232,099.73
  5. Step 5: Solve for x
    x = 1,232,099.73/1,072.72
  6. Step 6: Final answer
    x = 1,148.58

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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.