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Finding the Fourth Proportional to 318.72, 474.36 and 316.92

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Solution

The fourth proportional to 318.72, 474.36 and 316.92 is: 471.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.72 : 474.36 = 316.92 : x
  2. Step 2: Convert to fraction form
    318.72/474.36 = 316.92/x
  3. Step 3: Cross multiply
    318.72x = 474.36 × 316.92
  4. Step 4: Simplify right side
    318.72x = 150,334.17
  5. Step 5: Solve for x
    x = 150,334.17/318.72
  6. Step 6: Final answer
    x = 471.68

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.