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Finding the Fourth Proportional to 318.80, 477.98 and 140.62

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Solution

The fourth proportional to 318.80, 477.98 and 140.62 is: 210.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.80 : 477.98 = 140.62 : x
  2. Step 2: Convert to fraction form
    318.80/477.98 = 140.62/x
  3. Step 3: Cross multiply
    318.80x = 477.98 × 140.62
  4. Step 4: Simplify right side
    318.80x = 67,214.39
  5. Step 5: Solve for x
    x = 67,214.39/318.80
  6. Step 6: Final answer
    x = 210.83

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.