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Finding the Fourth Proportional to 317.96, 438.57 and 258.78

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Solution

The fourth proportional to 317.96, 438.57 and 258.78 is: 356.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.96 : 438.57 = 258.78 : x
  2. Step 2: Convert to fraction form
    317.96/438.57 = 258.78/x
  3. Step 3: Cross multiply
    317.96x = 438.57 × 258.78
  4. Step 4: Simplify right side
    317.96x = 113,493.14
  5. Step 5: Solve for x
    x = 113,493.14/317.96
  6. Step 6: Final answer
    x = 356.94

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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.