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Finding the Fourth Proportional to 409.21, 564.46 and 291.06

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Solution

The fourth proportional to 409.21, 564.46 and 291.06 is: 401.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.21 : 564.46 = 291.06 : x
  2. Step 2: Convert to fraction form
    409.21/564.46 = 291.06/x
  3. Step 3: Cross multiply
    409.21x = 564.46 × 291.06
  4. Step 4: Simplify right side
    409.21x = 164,291.00
  5. Step 5: Solve for x
    x = 164,291.00/409.21
  6. Step 6: Final answer
    x = 401.49

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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.