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Finding the Fourth Proportional to 326.88, 487.85 and 318.24

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Solution

The fourth proportional to 326.88, 487.85 and 318.24 is: 474.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.88 : 487.85 = 318.24 : x
  2. Step 2: Convert to fraction form
    326.88/487.85 = 318.24/x
  3. Step 3: Cross multiply
    326.88x = 487.85 × 318.24
  4. Step 4: Simplify right side
    326.88x = 155,251.79
  5. Step 5: Solve for x
    x = 155,251.79/326.88
  6. Step 6: Final answer
    x = 474.95

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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.