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Finding the Fourth Proportional to 487.96, 673.28 and 291.49

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Solution

The fourth proportional to 487.96, 673.28 and 291.49 is: 402.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.96 : 673.28 = 291.49 : x
  2. Step 2: Convert to fraction form
    487.96/673.28 = 291.49/x
  3. Step 3: Cross multiply
    487.96x = 673.28 × 291.49
  4. Step 4: Simplify right side
    487.96x = 196,254.39
  5. Step 5: Solve for x
    x = 196,254.39/487.96
  6. Step 6: Final answer
    x = 402.19

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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.