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Finding the Fourth Proportional to 285.77, 428.70 and 270.21

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Solution

The fourth proportional to 285.77, 428.70 and 270.21 is: 405.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.77 : 428.70 = 270.21 : x
  2. Step 2: Convert to fraction form
    285.77/428.70 = 270.21/x
  3. Step 3: Cross multiply
    285.77x = 428.70 × 270.21
  4. Step 4: Simplify right side
    285.77x = 115,839.03
  5. Step 5: Solve for x
    x = 115,839.03/285.77
  6. Step 6: Final answer
    x = 405.36

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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.