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Finding the Fourth Proportional to 318.05, 476.38 and 155.40

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Solution

The fourth proportional to 318.05, 476.38 and 155.40 is: 232.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.05 : 476.38 = 155.40 : x
  2. Step 2: Convert to fraction form
    318.05/476.38 = 155.40/x
  3. Step 3: Cross multiply
    318.05x = 476.38 × 155.40
  4. Step 4: Simplify right side
    318.05x = 74,027.86
  5. Step 5: Solve for x
    x = 74,027.86/318.05
  6. Step 6: Final answer
    x = 232.76

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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.