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Finding the Fourth Proportional to 318.78, 477.18 and 313.20

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Solution

The fourth proportional to 318.78, 477.18 and 313.20 is: 468.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.78 : 477.18 = 313.20 : x
  2. Step 2: Convert to fraction form
    318.78/477.18 = 313.20/x
  3. Step 3: Cross multiply
    318.78x = 477.18 × 313.20
  4. Step 4: Simplify right side
    318.78x = 149,452.78
  5. Step 5: Solve for x
    x = 149,452.78/318.78
  6. Step 6: Final answer
    x = 468.83

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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.