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Finding the Fourth Proportional to 495.75, 683.51 and 318.40

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Solution

The fourth proportional to 495.75, 683.51 and 318.40 is: 438.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    495.75 : 683.51 = 318.40 : x
  2. Step 2: Convert to fraction form
    495.75/683.51 = 318.40/x
  3. Step 3: Cross multiply
    495.75x = 683.51 × 318.40
  4. Step 4: Simplify right side
    495.75x = 217,628.67
  5. Step 5: Solve for x
    x = 217,628.67/495.75
  6. Step 6: Final answer
    x = 438.99

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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.