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Finding the Fourth Proportional to 494.86, 682.40 and 317.74

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Solution

The fourth proportional to 494.86, 682.40 and 317.74 is: 438.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    494.86 : 682.40 = 317.74 : x
  2. Step 2: Convert to fraction form
    494.86/682.40 = 317.74/x
  3. Step 3: Cross multiply
    494.86x = 682.40 × 317.74
  4. Step 4: Simplify right side
    494.86x = 216,825.78
  5. Step 5: Solve for x
    x = 216,825.78/494.86
  6. Step 6: Final answer
    x = 438.16

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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.