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Finding the Fourth Proportional to 409.56, 564.87 and 285.07

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Solution

The fourth proportional to 409.56, 564.87 and 285.07 is: 393.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.56 : 564.87 = 285.07 : x
  2. Step 2: Convert to fraction form
    409.56/564.87 = 285.07/x
  3. Step 3: Cross multiply
    409.56x = 564.87 × 285.07
  4. Step 4: Simplify right side
    409.56x = 161,028.21
  5. Step 5: Solve for x
    x = 161,028.21/409.56
  6. Step 6: Final answer
    x = 393.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.