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Finding the Fourth Proportional to 286.55, 431.35 and 205.95

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Solution

The fourth proportional to 286.55, 431.35 and 205.95 is: 310.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.55 : 431.35 = 205.95 : x
  2. Step 2: Convert to fraction form
    286.55/431.35 = 205.95/x
  3. Step 3: Cross multiply
    286.55x = 431.35 × 205.95
  4. Step 4: Simplify right side
    286.55x = 88,836.53
  5. Step 5: Solve for x
    x = 88,836.53/286.55
  6. Step 6: Final answer
    x = 310.02

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.