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Finding the Fourth Proportional to 315.96, 436.02 and 286.08

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Solution

The fourth proportional to 315.96, 436.02 and 286.08 is: 394.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.96 : 436.02 = 286.08 : x
  2. Step 2: Convert to fraction form
    315.96/436.02 = 286.08/x
  3. Step 3: Cross multiply
    315.96x = 436.02 × 286.08
  4. Step 4: Simplify right side
    315.96x = 124,736.60
  5. Step 5: Solve for x
    x = 124,736.60/315.96
  6. Step 6: Final answer
    x = 394.79

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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.