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Finding the Fourth Proportional to 688.04, 949.31 and 408.05

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Solution

The fourth proportional to 688.04, 949.31 and 408.05 is: 562.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.04 : 949.31 = 408.05 : x
  2. Step 2: Convert to fraction form
    688.04/949.31 = 408.05/x
  3. Step 3: Cross multiply
    688.04x = 949.31 × 408.05
  4. Step 4: Simplify right side
    688.04x = 387,362.22
  5. Step 5: Solve for x
    x = 387,362.22/688.04
  6. Step 6: Final answer
    x = 562.99

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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.