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Finding the Fourth Proportional to 474, 711.24 and 311.76

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Solution

The fourth proportional to 474, 711.24 and 311.76 is: 467.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    474 : 711.24 = 311.76 : x
  2. Step 2: Convert to fraction form
    474/711.24 = 311.76/x
  3. Step 3: Cross multiply
    474x = 711.24 × 311.76
  4. Step 4: Simplify right side
    474x = 221,736.18
  5. Step 5: Solve for x
    x = 221,736.18/474
  6. Step 6: Final answer
    x = 467.80

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