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Finding the Fourth Proportional to 492.81, 680.06 and 318.16

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Solution

The fourth proportional to 492.81, 680.06 and 318.16 is: 439.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.81 : 680.06 = 318.16 : x
  2. Step 2: Convert to fraction form
    492.81/680.06 = 318.16/x
  3. Step 3: Cross multiply
    492.81x = 680.06 × 318.16
  4. Step 4: Simplify right side
    492.81x = 216,362.90
  5. Step 5: Solve for x
    x = 216,362.90/492.81
  6. Step 6: Final answer
    x = 439.04

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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.