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Finding the Fourth Proportional to 318.96, 477.75 and 312.72

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Solution

The fourth proportional to 318.96, 477.75 and 312.72 is: 468.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.96 : 477.75 = 312.72 : x
  2. Step 2: Convert to fraction form
    318.96/477.75 = 312.72/x
  3. Step 3: Cross multiply
    318.96x = 477.75 × 312.72
  4. Step 4: Simplify right side
    318.96x = 149,401.98
  5. Step 5: Solve for x
    x = 149,401.98/318.96
  6. Step 6: Final answer
    x = 468.40

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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.