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Finding the Fourth Proportional to 934.03, 1,286.89 and 638.79

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Solution

The fourth proportional to 934.03, 1,286.89 and 638.79 is: 880.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.03 : 1,286.89 = 638.79 : x
  2. Step 2: Convert to fraction form
    934.03/1,286.89 = 638.79/x
  3. Step 3: Cross multiply
    934.03x = 1,286.89 × 638.79
  4. Step 4: Simplify right side
    934.03x = 822,052.46
  5. Step 5: Solve for x
    x = 822,052.46/934.03
  6. Step 6: Final answer
    x = 880.11

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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.