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Finding the Fourth Proportional to 487.82, 673.11 and 291.30

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Solution

The fourth proportional to 487.82, 673.11 and 291.30 is: 401.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.82 : 673.11 = 291.30 : x
  2. Step 2: Convert to fraction form
    487.82/673.11 = 291.30/x
  3. Step 3: Cross multiply
    487.82x = 673.11 × 291.30
  4. Step 4: Simplify right side
    487.82x = 196,076.94
  5. Step 5: Solve for x
    x = 196,076.94/487.82
  6. Step 6: Final answer
    x = 401.95

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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.