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Finding the Fourth Proportional to 494.93, 682.55 and 317.69

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Solution

The fourth proportional to 494.93, 682.55 and 317.69 is: 438.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    494.93 : 682.55 = 317.69 : x
  2. Step 2: Convert to fraction form
    494.93/682.55 = 317.69/x
  3. Step 3: Cross multiply
    494.93x = 682.55 × 317.69
  4. Step 4: Simplify right side
    494.93x = 216,835.90
  5. Step 5: Solve for x
    x = 216,835.90/494.93
  6. Step 6: Final answer
    x = 438.12

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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.