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Finding the Fourth Proportional to 315.52, 435.38 and 189.46

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Solution

The fourth proportional to 315.52, 435.38 and 189.46 is: 261.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.52 : 435.38 = 189.46 : x
  2. Step 2: Convert to fraction form
    315.52/435.38 = 189.46/x
  3. Step 3: Cross multiply
    315.52x = 435.38 × 189.46
  4. Step 4: Simplify right side
    315.52x = 82,487.09
  5. Step 5: Solve for x
    x = 82,487.09/315.52
  6. Step 6: Final answer
    x = 261.43

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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.