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Finding the Fourth Proportional to 892.10, 1,229.64 and 643.07

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Solution

The fourth proportional to 892.10, 1,229.64 and 643.07 is: 886.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.10 : 1,229.64 = 643.07 : x
  2. Step 2: Convert to fraction form
    892.10/1,229.64 = 643.07/x
  3. Step 3: Cross multiply
    892.10x = 1,229.64 × 643.07
  4. Step 4: Simplify right side
    892.10x = 790,744.59
  5. Step 5: Solve for x
    x = 790,744.59/892.10
  6. Step 6: Final answer
    x = 886.39

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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.