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Finding the Fourth Proportional to 492.82, 679.80 and 317.86

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Solution

The fourth proportional to 492.82, 679.80 and 317.86 is: 438.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.82 : 679.80 = 317.86 : x
  2. Step 2: Convert to fraction form
    492.82/679.80 = 317.86/x
  3. Step 3: Cross multiply
    492.82x = 679.80 × 317.86
  4. Step 4: Simplify right side
    492.82x = 216,081.23
  5. Step 5: Solve for x
    x = 216,081.23/492.82
  6. Step 6: Final answer
    x = 438.46

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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.