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Finding the Fourth Proportional to 329.80, 455.07 and 318.76

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Solution

The fourth proportional to 329.80, 455.07 and 318.76 is: 439.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    329.80 : 455.07 = 318.76 : x
  2. Step 2: Convert to fraction form
    329.80/455.07 = 318.76/x
  3. Step 3: Cross multiply
    329.80x = 455.07 × 318.76
  4. Step 4: Simplify right side
    329.80x = 145,058.11
  5. Step 5: Solve for x
    x = 145,058.11/329.80
  6. Step 6: Final answer
    x = 439.84

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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.