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Finding the Fourth Proportional to 318.12, 476.56 and 155.31

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Solution

The fourth proportional to 318.12, 476.56 and 155.31 is: 232.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.12 : 476.56 = 155.31 : x
  2. Step 2: Convert to fraction form
    318.12/476.56 = 155.31/x
  3. Step 3: Cross multiply
    318.12x = 476.56 × 155.31
  4. Step 4: Simplify right side
    318.12x = 74,014.53
  5. Step 5: Solve for x
    x = 74,014.53/318.12
  6. Step 6: Final answer
    x = 232.66

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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.