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Finding the Fourth Proportional to 316.49, 436.65 and 218.30

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Solution

The fourth proportional to 316.49, 436.65 and 218.30 is: 301.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.49 : 436.65 = 218.30 : x
  2. Step 2: Convert to fraction form
    316.49/436.65 = 218.30/x
  3. Step 3: Cross multiply
    316.49x = 436.65 × 218.30
  4. Step 4: Simplify right side
    316.49x = 95,319.54
  5. Step 5: Solve for x
    x = 95,319.54/316.49
  6. Step 6: Final answer
    x = 301.18

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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.