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Finding the Fourth Proportional to 626.57, 864.89 and 405.60

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Solution

The fourth proportional to 626.57, 864.89 and 405.60 is: 559.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.57 : 864.89 = 405.60 : x
  2. Step 2: Convert to fraction form
    626.57/864.89 = 405.60/x
  3. Step 3: Cross multiply
    626.57x = 864.89 × 405.60
  4. Step 4: Simplify right side
    626.57x = 350,797.36
  5. Step 5: Solve for x
    x = 350,797.36/626.57
  6. Step 6: Final answer
    x = 559.87

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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.