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Finding the Fourth Proportional to 317.98, 438.85 and 178.12

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Solution

The fourth proportional to 317.98, 438.85 and 178.12 is: 245.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.98 : 438.85 = 178.12 : x
  2. Step 2: Convert to fraction form
    317.98/438.85 = 178.12/x
  3. Step 3: Cross multiply
    317.98x = 438.85 × 178.12
  4. Step 4: Simplify right side
    317.98x = 78,167.96
  5. Step 5: Solve for x
    x = 78,167.96/317.98
  6. Step 6: Final answer
    x = 245.83

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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.