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Finding the Fourth Proportional to 621.62, 931.94 and 279.38

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Solution

The fourth proportional to 621.62, 931.94 and 279.38 is: 418.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.62 : 931.94 = 279.38 : x
  2. Step 2: Convert to fraction form
    621.62/931.94 = 279.38/x
  3. Step 3: Cross multiply
    621.62x = 931.94 × 279.38
  4. Step 4: Simplify right side
    621.62x = 260,365.40
  5. Step 5: Solve for x
    x = 260,365.40/621.62
  6. Step 6: Final answer
    x = 418.85

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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.