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Finding the Fourth Proportional to 492.86, 679.92 and 318.26

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Solution

The fourth proportional to 492.86, 679.92 and 318.26 is: 439.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.86 : 679.92 = 318.26 : x
  2. Step 2: Convert to fraction form
    492.86/679.92 = 318.26/x
  3. Step 3: Cross multiply
    492.86x = 679.92 × 318.26
  4. Step 4: Simplify right side
    492.86x = 216,391.34
  5. Step 5: Solve for x
    x = 216,391.34/492.86
  6. Step 6: Final answer
    x = 439.05

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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.