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Finding the Fourth Proportional to 338.78, 469.96 and 314.48

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Solution

The fourth proportional to 338.78, 469.96 and 314.48 is: 436.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    338.78 : 469.96 = 314.48 : x
  2. Step 2: Convert to fraction form
    338.78/469.96 = 314.48/x
  3. Step 3: Cross multiply
    338.78x = 469.96 × 314.48
  4. Step 4: Simplify right side
    338.78x = 147,793.02
  5. Step 5: Solve for x
    x = 147,793.02/338.78
  6. Step 6: Final answer
    x = 436.25

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.