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Finding the Fourth Proportional to 318.44, 478.46 and 156.44

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Solution

The fourth proportional to 318.44, 478.46 and 156.44 is: 235.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.44 : 478.46 = 156.44 : x
  2. Step 2: Convert to fraction form
    318.44/478.46 = 156.44/x
  3. Step 3: Cross multiply
    318.44x = 478.46 × 156.44
  4. Step 4: Simplify right side
    318.44x = 74,850.28
  5. Step 5: Solve for x
    x = 74,850.28/318.44
  6. Step 6: Final answer
    x = 235.05

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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.