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Finding the Fourth Proportional to 854.34, 1,279.35 and 638.34

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Solution

The fourth proportional to 854.34, 1,279.35 and 638.34 is: 955.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.34 : 1,279.35 = 638.34 : x
  2. Step 2: Convert to fraction form
    854.34/1,279.35 = 638.34/x
  3. Step 3: Cross multiply
    854.34x = 1,279.35 × 638.34
  4. Step 4: Simplify right side
    854.34x = 816,660.28
  5. Step 5: Solve for x
    x = 816,660.28/854.34
  6. Step 6: Final answer
    x = 955.90

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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.