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Finding the Fourth Proportional to 286.16, 428.88 and 141.92

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Solution

The fourth proportional to 286.16, 428.88 and 141.92 is: 212.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.16 : 428.88 = 141.92 : x
  2. Step 2: Convert to fraction form
    286.16/428.88 = 141.92/x
  3. Step 3: Cross multiply
    286.16x = 428.88 × 141.92
  4. Step 4: Simplify right side
    286.16x = 60,866.65
  5. Step 5: Solve for x
    x = 60,866.65/286.16
  6. Step 6: Final answer
    x = 212.70

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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.