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Finding the Fourth Proportional to 685.25, 946.89 and 488.42

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Solution

The fourth proportional to 685.25, 946.89 and 488.42 is: 674.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.25 : 946.89 = 488.42 : x
  2. Step 2: Convert to fraction form
    685.25/946.89 = 488.42/x
  3. Step 3: Cross multiply
    685.25x = 946.89 × 488.42
  4. Step 4: Simplify right side
    685.25x = 462,480.01
  5. Step 5: Solve for x
    x = 462,480.01/685.25
  6. Step 6: Final answer
    x = 674.91

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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.