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Finding the Fourth Proportional to 862.89, 1,190.03 and 673.89

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Solution

The fourth proportional to 862.89, 1,190.03 and 673.89 is: 929.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.89 : 1,190.03 = 673.89 : x
  2. Step 2: Convert to fraction form
    862.89/1,190.03 = 673.89/x
  3. Step 3: Cross multiply
    862.89x = 1,190.03 × 673.89
  4. Step 4: Simplify right side
    862.89x = 801,941.48
  5. Step 5: Solve for x
    x = 801,941.48/862.89
  6. Step 6: Final answer
    x = 929.37

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.