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Finding the Fourth Proportional to 495.21, 683.70 and 318.25

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Solution

The fourth proportional to 495.21, 683.70 and 318.25 is: 439.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    495.21 : 683.70 = 318.25 : x
  2. Step 2: Convert to fraction form
    495.21/683.70 = 318.25/x
  3. Step 3: Cross multiply
    495.21x = 683.70 × 318.25
  4. Step 4: Simplify right side
    495.21x = 217,585.02
  5. Step 5: Solve for x
    x = 217,585.02/495.21
  6. Step 6: Final answer
    x = 439.38

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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.