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Finding the Fourth Proportional to 892.89, 1,230.50 and 643.79

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Solution

The fourth proportional to 892.89, 1,230.50 and 643.79 is: 887.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.89 : 1,230.50 = 643.79 : x
  2. Step 2: Convert to fraction form
    892.89/1,230.50 = 643.79/x
  3. Step 3: Cross multiply
    892.89x = 1,230.50 × 643.79
  4. Step 4: Simplify right side
    892.89x = 792,174.22
  5. Step 5: Solve for x
    x = 792,174.22/892.89
  6. Step 6: Final answer
    x = 887.20

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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.