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Finding the Fourth Proportional to 1,073.41, 1,609.87 and 640.69

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Solution

The fourth proportional to 1,073.41, 1,609.87 and 640.69 is: 960.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,073.41 : 1,609.87 = 640.69 : x
  2. Step 2: Convert to fraction form
    1,073.41/1,609.87 = 640.69/x
  3. Step 3: Cross multiply
    1,073.41x = 1,609.87 × 640.69
  4. Step 4: Simplify right side
    1,073.41x = 1,031,427.61
  5. Step 5: Solve for x
    x = 1,031,427.61/1,073.41
  6. Step 6: Final answer
    x = 960.89

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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.