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Finding the Fourth Proportional to 315.39, 435.09 and 204.87

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Solution

The fourth proportional to 315.39, 435.09 and 204.87 is: 282.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.39 : 435.09 = 204.87 : x
  2. Step 2: Convert to fraction form
    315.39/435.09 = 204.87/x
  3. Step 3: Cross multiply
    315.39x = 435.09 × 204.87
  4. Step 4: Simplify right side
    315.39x = 89,136.89
  5. Step 5: Solve for x
    x = 89,136.89/315.39
  6. Step 6: Final answer
    x = 282.62

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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.