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Finding the Fourth Proportional to 326.49, 487.21 and 291.88

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Solution

The fourth proportional to 326.49, 487.21 and 291.88 is: 435.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.49 : 487.21 = 291.88 : x
  2. Step 2: Convert to fraction form
    326.49/487.21 = 291.88/x
  3. Step 3: Cross multiply
    326.49x = 487.21 × 291.88
  4. Step 4: Simplify right side
    326.49x = 142,202.96
  5. Step 5: Solve for x
    x = 142,202.96/326.49
  6. Step 6: Final answer
    x = 435.55

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.