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Finding the Fourth Proportional to 316.40, 436.24 and 218.16

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Solution

The fourth proportional to 316.40, 436.24 and 218.16 is: 300.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.40 : 436.24 = 218.16 : x
  2. Step 2: Convert to fraction form
    316.40/436.24 = 218.16/x
  3. Step 3: Cross multiply
    316.40x = 436.24 × 218.16
  4. Step 4: Simplify right side
    316.40x = 95,170.12
  5. Step 5: Solve for x
    x = 95,170.12/316.40
  6. Step 6: Final answer
    x = 300.79

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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.