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Finding the Fourth Proportional to 438.75, 658.05 and 146.38

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Solution

The fourth proportional to 438.75, 658.05 and 146.38 is: 219.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.75 : 658.05 = 146.38 : x
  2. Step 2: Convert to fraction form
    438.75/658.05 = 146.38/x
  3. Step 3: Cross multiply
    438.75x = 658.05 × 146.38
  4. Step 4: Simplify right side
    438.75x = 96,325.36
  5. Step 5: Solve for x
    x = 96,325.36/438.75
  6. Step 6: Final answer
    x = 219.54

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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.