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Finding the Fourth Proportional to 492.64, 679.05 and 394.24

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Solution

The fourth proportional to 492.64, 679.05 and 394.24 is: 543.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.64 : 679.05 = 394.24 : x
  2. Step 2: Convert to fraction form
    492.64/679.05 = 394.24/x
  3. Step 3: Cross multiply
    492.64x = 679.05 × 394.24
  4. Step 4: Simplify right side
    492.64x = 267,708.67
  5. Step 5: Solve for x
    x = 267,708.67/492.64
  6. Step 6: Final answer
    x = 543.42

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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.