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Finding the Fourth Proportional to 286.80, 429.12 and 238.20

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Solution

The fourth proportional to 286.80, 429.12 and 238.20 is: 356.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.80 : 429.12 = 238.20 : x
  2. Step 2: Convert to fraction form
    286.80/429.12 = 238.20/x
  3. Step 3: Cross multiply
    286.80x = 429.12 × 238.20
  4. Step 4: Simplify right side
    286.80x = 102,216.38
  5. Step 5: Solve for x
    x = 102,216.38/286.80
  6. Step 6: Final answer
    x = 356.40

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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.