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Finding the Fourth Proportional to 484.55, 668.50 and 318.85

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Solution

The fourth proportional to 484.55, 668.50 and 318.85 is: 439.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    484.55 : 668.50 = 318.85 : x
  2. Step 2: Convert to fraction form
    484.55/668.50 = 318.85/x
  3. Step 3: Cross multiply
    484.55x = 668.50 × 318.85
  4. Step 4: Simplify right side
    484.55x = 213,151.23
  5. Step 5: Solve for x
    x = 213,151.23/484.55
  6. Step 6: Final answer
    x = 439.90

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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.