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Finding the Fourth Proportional to 315.69, 435.72 and 205.12

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Solution

The fourth proportional to 315.69, 435.72 and 205.12 is: 283.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.69 : 435.72 = 205.12 : x
  2. Step 2: Convert to fraction form
    315.69/435.72 = 205.12/x
  3. Step 3: Cross multiply
    315.69x = 435.72 × 205.12
  4. Step 4: Simplify right side
    315.69x = 89,374.89
  5. Step 5: Solve for x
    x = 89,374.89/315.69
  6. Step 6: Final answer
    x = 283.11

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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.