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Finding the Fourth Proportional to 331.80, 455.03 and 318.30

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Solution

The fourth proportional to 331.80, 455.03 and 318.30 is: 436.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.80 : 455.03 = 318.30 : x
  2. Step 2: Convert to fraction form
    331.80/455.03 = 318.30/x
  3. Step 3: Cross multiply
    331.80x = 455.03 × 318.30
  4. Step 4: Simplify right side
    331.80x = 144,834.46
  5. Step 5: Solve for x
    x = 144,834.46/331.80
  6. Step 6: Final answer
    x = 436.51

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.