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Finding the Fourth Proportional to 626.81, 864.70 and 405.82

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Solution

The fourth proportional to 626.81, 864.70 and 405.82 is: 559.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.81 : 864.70 = 405.82 : x
  2. Step 2: Convert to fraction form
    626.81/864.70 = 405.82/x
  3. Step 3: Cross multiply
    626.81x = 864.70 × 405.82
  4. Step 4: Simplify right side
    626.81x = 350,912.62
  5. Step 5: Solve for x
    x = 350,912.62/626.81
  6. Step 6: Final answer
    x = 559.84

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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.