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Finding the Fourth Proportional to 688.61, 950.15 and 409.06

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Solution

The fourth proportional to 688.61, 950.15 and 409.06 is: 564.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.61 : 950.15 = 409.06 : x
  2. Step 2: Convert to fraction form
    688.61/950.15 = 409.06/x
  3. Step 3: Cross multiply
    688.61x = 950.15 × 409.06
  4. Step 4: Simplify right side
    688.61x = 388,668.36
  5. Step 5: Solve for x
    x = 388,668.36/688.61
  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.