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Finding the Fourth Proportional to 487.92, 673.12 and 291.44

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Solution

The fourth proportional to 487.92, 673.12 and 291.44 is: 402.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.92 : 673.12 = 291.44 : x
  2. Step 2: Convert to fraction form
    487.92/673.12 = 291.44/x
  3. Step 3: Cross multiply
    487.92x = 673.12 × 291.44
  4. Step 4: Simplify right side
    487.92x = 196,171.82
  5. Step 5: Solve for x
    x = 196,171.82/487.92
  6. Step 6: Final answer
    x = 402.05

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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.