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Finding the Fourth Proportional to 492.45, 679.50 and 306.15

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Solution

The fourth proportional to 492.45, 679.50 and 306.15 is: 422.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.45 : 679.50 = 306.15 : x
  2. Step 2: Convert to fraction form
    492.45/679.50 = 306.15/x
  3. Step 3: Cross multiply
    492.45x = 679.50 × 306.15
  4. Step 4: Simplify right side
    492.45x = 208,028.93
  5. Step 5: Solve for x
    x = 208,028.93/492.45
  6. Step 6: Final answer
    x = 422.44

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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.