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Finding the Fourth Proportional to 492.42, 679.72 and 317.76

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Solution

The fourth proportional to 492.42, 679.72 and 317.76 is: 438.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.42 : 679.72 = 317.76 : x
  2. Step 2: Convert to fraction form
    492.42/679.72 = 317.76/x
  3. Step 3: Cross multiply
    492.42x = 679.72 × 317.76
  4. Step 4: Simplify right side
    492.42x = 215,987.83
  5. Step 5: Solve for x
    x = 215,987.83/492.42
  6. Step 6: Final answer
    x = 438.63

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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.