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Finding the Fourth Proportional to 685.24, 945.53 and 405.49

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Solution

The fourth proportional to 685.24, 945.53 and 405.49 is: 559.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.24 : 945.53 = 405.49 : x
  2. Step 2: Convert to fraction form
    685.24/945.53 = 405.49/x
  3. Step 3: Cross multiply
    685.24x = 945.53 × 405.49
  4. Step 4: Simplify right side
    685.24x = 383,399.25
  5. Step 5: Solve for x
    x = 383,399.25/685.24
  6. Step 6: Final answer
    x = 559.51

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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.