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Finding the Fourth Proportional to 492.42, 679.84 and 315.38

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Solution

The fourth proportional to 492.42, 679.84 and 315.38 is: 435.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.42 : 679.84 = 315.38 : x
  2. Step 2: Convert to fraction form
    492.42/679.84 = 315.38/x
  3. Step 3: Cross multiply
    492.42x = 679.84 × 315.38
  4. Step 4: Simplify right side
    492.42x = 214,407.94
  5. Step 5: Solve for x
    x = 214,407.94/492.42
  6. Step 6: Final answer
    x = 435.42

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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.