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Finding the Fourth Proportional to 492.34, 679.20 and 315.21

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Solution

The fourth proportional to 492.34, 679.20 and 315.21 is: 434.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.34 : 679.20 = 315.21 : x
  2. Step 2: Convert to fraction form
    492.34/679.20 = 315.21/x
  3. Step 3: Cross multiply
    492.34x = 679.20 × 315.21
  4. Step 4: Simplify right side
    492.34x = 214,090.63
  5. Step 5: Solve for x
    x = 214,090.63/492.34
  6. Step 6: Final answer
    x = 434.84

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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.