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Finding the Fourth Proportional to 315.97, 436.12 and 285.19

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Solution

The fourth proportional to 315.97, 436.12 and 285.19 is: 393.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.97 : 436.12 = 285.19 : x
  2. Step 2: Convert to fraction form
    315.97/436.12 = 285.19/x
  3. Step 3: Cross multiply
    315.97x = 436.12 × 285.19
  4. Step 4: Simplify right side
    315.97x = 124,375.26
  5. Step 5: Solve for x
    x = 124,375.26/315.97
  6. Step 6: Final answer
    x = 393.63

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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.