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Finding the Fourth Proportional to 326.84, 453.20 and 315.90

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Solution

The fourth proportional to 326.84, 453.20 and 315.90 is: 438.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.84 : 453.20 = 315.90 : x
  2. Step 2: Convert to fraction form
    326.84/453.20 = 315.90/x
  3. Step 3: Cross multiply
    326.84x = 453.20 × 315.90
  4. Step 4: Simplify right side
    326.84x = 143,164.30
  5. Step 5: Solve for x
    x = 143,164.30/326.84
  6. Step 6: Final answer
    x = 438.03

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.