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Finding the Fourth Proportional to 318.05, 438.90 and 178.16

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Solution

The fourth proportional to 318.05, 438.90 and 178.16 is: 245.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.05 : 438.90 = 178.16 : x
  2. Step 2: Convert to fraction form
    318.05/438.90 = 178.16/x
  3. Step 3: Cross multiply
    318.05x = 438.90 × 178.16
  4. Step 4: Simplify right side
    318.05x = 78,192.23
  5. Step 5: Solve for x
    x = 78,192.23/318.05
  6. Step 6: Final answer
    x = 245.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.