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Finding the Fourth Proportional to 402.33, 554.85 and 319.31

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Solution

The fourth proportional to 402.33, 554.85 and 319.31 is: 440.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.33 : 554.85 = 319.31 : x
  2. Step 2: Convert to fraction form
    402.33/554.85 = 319.31/x
  3. Step 3: Cross multiply
    402.33x = 554.85 × 319.31
  4. Step 4: Simplify right side
    402.33x = 177,169.15
  5. Step 5: Solve for x
    x = 177,169.15/402.33
  6. Step 6: Final answer
    x = 440.36

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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.