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Finding the Fourth Proportional to 318.48, 476.64 and 311.28

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Solution

The fourth proportional to 318.48, 476.64 and 311.28 is: 465.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.48 : 476.64 = 311.28 : x
  2. Step 2: Convert to fraction form
    318.48/476.64 = 311.28/x
  3. Step 3: Cross multiply
    318.48x = 476.64 × 311.28
  4. Step 4: Simplify right side
    318.48x = 148,368.50
  5. Step 5: Solve for x
    x = 148,368.50/318.48
  6. Step 6: Final answer
    x = 465.86

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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.