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Finding the Fourth Proportional to 611.44, 918.53 and 438.55

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Solution

The fourth proportional to 611.44, 918.53 and 438.55 is: 658.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.44 : 918.53 = 438.55 : x
  2. Step 2: Convert to fraction form
    611.44/918.53 = 438.55/x
  3. Step 3: Cross multiply
    611.44x = 918.53 × 438.55
  4. Step 4: Simplify right side
    611.44x = 402,821.33
  5. Step 5: Solve for x
    x = 402,821.33/611.44
  6. Step 6: Final answer
    x = 658.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.