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Finding the Fourth Proportional to 487.91, 673.88 and 355.73

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Solution

The fourth proportional to 487.91, 673.88 and 355.73 is: 491.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.91 : 673.88 = 355.73 : x
  2. Step 2: Convert to fraction form
    487.91/673.88 = 355.73/x
  3. Step 3: Cross multiply
    487.91x = 673.88 × 355.73
  4. Step 4: Simplify right side
    487.91x = 239,716.19
  5. Step 5: Solve for x
    x = 239,716.19/487.91
  6. Step 6: Final answer
    x = 491.31

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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.