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Finding the Fourth Proportional to 316.49, 436.82 and 257.85

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Solution

The fourth proportional to 316.49, 436.82 and 257.85 is: 355.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.49 : 436.82 = 257.85 : x
  2. Step 2: Convert to fraction form
    316.49/436.82 = 257.85/x
  3. Step 3: Cross multiply
    316.49x = 436.82 × 257.85
  4. Step 4: Simplify right side
    316.49x = 112,632.75
  5. Step 5: Solve for x
    x = 112,632.75/316.49
  6. Step 6: Final answer
    x = 355.89

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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.