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Finding the Fourth Proportional to 492.18, 679.34 and 317.82

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Solution

The fourth proportional to 492.18, 679.34 and 317.82 is: 438.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.18 : 679.34 = 317.82 : x
  2. Step 2: Convert to fraction form
    492.18/679.34 = 317.82/x
  3. Step 3: Cross multiply
    492.18x = 679.34 × 317.82
  4. Step 4: Simplify right side
    492.18x = 215,909.39
  5. Step 5: Solve for x
    x = 215,909.39/492.18
  6. Step 6: Final answer
    x = 438.68

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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.