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Finding the Fourth Proportional to 685.84, 945.22 and 519.64

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Solution

The fourth proportional to 685.84, 945.22 and 519.64 is: 716.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.84 : 945.22 = 519.64 : x
  2. Step 2: Convert to fraction form
    685.84/945.22 = 519.64/x
  3. Step 3: Cross multiply
    685.84x = 945.22 × 519.64
  4. Step 4: Simplify right side
    685.84x = 491,174.12
  5. Step 5: Solve for x
    x = 491,174.12/685.84
  6. Step 6: Final answer
    x = 716.16

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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.