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Finding the Fourth Proportional to 492.40, 679.08 and 394.12

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Solution

The fourth proportional to 492.40, 679.08 and 394.12 is: 543.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.40 : 679.08 = 394.12 : x
  2. Step 2: Convert to fraction form
    492.40/679.08 = 394.12/x
  3. Step 3: Cross multiply
    492.40x = 679.08 × 394.12
  4. Step 4: Simplify right side
    492.40x = 267,639.01
  5. Step 5: Solve for x
    x = 267,639.01/492.40
  6. Step 6: Final answer
    x = 543.54

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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.