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Finding the Fourth Proportional to 492.32, 679.12 and 308

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Solution

The fourth proportional to 492.32, 679.12 and 308 is: 424.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.32 : 679.12 = 308 : x
  2. Step 2: Convert to fraction form
    492.32/679.12 = 308/x
  3. Step 3: Cross multiply
    492.32x = 679.12 × 308
  4. Step 4: Simplify right side
    492.32x = 209,168.96
  5. Step 5: Solve for x
    x = 209,168.96/492.32
  6. Step 6: Final answer
    x = 424.86

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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.