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Finding the Fourth Proportional to 492.34, 679.21 and 315.36

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Solution

The fourth proportional to 492.34, 679.21 and 315.36 is: 435.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.34 : 679.21 = 315.36 : x
  2. Step 2: Convert to fraction form
    492.34/679.21 = 315.36/x
  3. Step 3: Cross multiply
    492.34x = 679.21 × 315.36
  4. Step 4: Simplify right side
    492.34x = 214,195.67
  5. Step 5: Solve for x
    x = 214,195.67/492.34
  6. Step 6: Final answer
    x = 435.06

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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.