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Finding the Fourth Proportional to 409.05, 564.10 and 315.64

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Solution

The fourth proportional to 409.05, 564.10 and 315.64 is: 435.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.05 : 564.10 = 315.64 : x
  2. Step 2: Convert to fraction form
    409.05/564.10 = 315.64/x
  3. Step 3: Cross multiply
    409.05x = 564.10 × 315.64
  4. Step 4: Simplify right side
    409.05x = 178,054.03
  5. Step 5: Solve for x
    x = 178,054.03/409.05
  6. Step 6: Final answer
    x = 435.29

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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.