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Finding the Fourth Proportional to 500.67, 690.91 and 279.61

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Solution

The fourth proportional to 500.67, 690.91 and 279.61 is: 385.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.67 : 690.91 = 279.61 : x
  2. Step 2: Convert to fraction form
    500.67/690.91 = 279.61/x
  3. Step 3: Cross multiply
    500.67x = 690.91 × 279.61
  4. Step 4: Simplify right side
    500.67x = 193,185.35
  5. Step 5: Solve for x
    x = 193,185.35/500.67
  6. Step 6: Final answer
    x = 385.85

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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.