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Finding the Fourth Proportional to 286.95, 429.75 and 171.30

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Solution

The fourth proportional to 286.95, 429.75 and 171.30 is: 256.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.95 : 429.75 = 171.30 : x
  2. Step 2: Convert to fraction form
    286.95/429.75 = 171.30/x
  3. Step 3: Cross multiply
    286.95x = 429.75 × 171.30
  4. Step 4: Simplify right side
    286.95x = 73,616.18
  5. Step 5: Solve for x
    x = 73,616.18/286.95
  6. Step 6: Final answer
    x = 256.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.