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Finding the Fourth Proportional to 494.57, 682.34 and 307.91

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Solution

The fourth proportional to 494.57, 682.34 and 307.91 is: 424.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    494.57 : 682.34 = 307.91 : x
  2. Step 2: Convert to fraction form
    494.57/682.34 = 307.91/x
  3. Step 3: Cross multiply
    494.57x = 682.34 × 307.91
  4. Step 4: Simplify right side
    494.57x = 210,096.55
  5. Step 5: Solve for x
    x = 210,096.55/494.57
  6. Step 6: Final answer
    x = 424.81

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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.