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Finding the Fourth Proportional to 493.51, 681.11 and 318.73

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Solution

The fourth proportional to 493.51, 681.11 and 318.73 is: 439.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    493.51 : 681.11 = 318.73 : x
  2. Step 2: Convert to fraction form
    493.51/681.11 = 318.73/x
  3. Step 3: Cross multiply
    493.51x = 681.11 × 318.73
  4. Step 4: Simplify right side
    493.51x = 217,088.60
  5. Step 5: Solve for x
    x = 217,088.60/493.51
  6. Step 6: Final answer
    x = 439.89

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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.