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Finding the Fourth Proportional to 286.56, 428.76 and 262.80

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Solution

The fourth proportional to 286.56, 428.76 and 262.80 is: 393.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.56 : 428.76 = 262.80 : x
  2. Step 2: Convert to fraction form
    286.56/428.76 = 262.80/x
  3. Step 3: Cross multiply
    286.56x = 428.76 × 262.80
  4. Step 4: Simplify right side
    286.56x = 112,678.13
  5. Step 5: Solve for x
    x = 112,678.13/286.56
  6. Step 6: Final answer
    x = 393.21

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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.