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Finding the Fourth Proportional to 484.20, 668.50 and 318.71

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Solution

The fourth proportional to 484.20, 668.50 and 318.71 is: 440.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    484.20 : 668.50 = 318.71 : x
  2. Step 2: Convert to fraction form
    484.20/668.50 = 318.71/x
  3. Step 3: Cross multiply
    484.20x = 668.50 × 318.71
  4. Step 4: Simplify right side
    484.20x = 213,058.51
  5. Step 5: Solve for x
    x = 213,058.51/484.20
  6. Step 6: Final answer
    x = 440.02

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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.