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Finding the Fourth Proportional to 492.96, 679.94 and 399.71

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Solution

The fourth proportional to 492.96, 679.94 and 399.71 is: 551.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.96 : 679.94 = 399.71 : x
  2. Step 2: Convert to fraction form
    492.96/679.94 = 399.71/x
  3. Step 3: Cross multiply
    492.96x = 679.94 × 399.71
  4. Step 4: Simplify right side
    492.96x = 271,774.92
  5. Step 5: Solve for x
    x = 271,774.92/492.96
  6. Step 6: Final answer
    x = 551.32

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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.