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Finding the Fourth Proportional to 315.54, 435.30 and 205.18

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Solution

The fourth proportional to 315.54, 435.30 and 205.18 is: 283.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.54 : 435.30 = 205.18 : x
  2. Step 2: Convert to fraction form
    315.54/435.30 = 205.18/x
  3. Step 3: Cross multiply
    315.54x = 435.30 × 205.18
  4. Step 4: Simplify right side
    315.54x = 89,314.85
  5. Step 5: Solve for x
    x = 89,314.85/315.54
  6. Step 6: Final answer
    x = 283.05

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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.