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Finding the Fourth Proportional to 685.25, 945.28 and 488.87

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Solution

The fourth proportional to 685.25, 945.28 and 488.87 is: 674.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.25 : 945.28 = 488.87 : x
  2. Step 2: Convert to fraction form
    685.25/945.28 = 488.87/x
  3. Step 3: Cross multiply
    685.25x = 945.28 × 488.87
  4. Step 4: Simplify right side
    685.25x = 462,116.59
  5. Step 5: Solve for x
    x = 462,116.59/685.25
  6. Step 6: Final answer
    x = 674.38

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Double scale
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1.5x scale

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.