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Finding the Fourth Proportional to 688.63, 950.31 and 409

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Solution

The fourth proportional to 688.63, 950.31 and 409 is: 564.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.63 : 950.31 = 409 : x
  2. Step 2: Convert to fraction form
    688.63/950.31 = 409/x
  3. Step 3: Cross multiply
    688.63x = 950.31 × 409
  4. Step 4: Simplify right side
    688.63x = 388,676.79
  5. Step 5: Solve for x
    x = 388,676.79/688.63
  6. Step 6: Final answer
    x = 564.42

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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.