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Finding the Fourth Proportional to 438.23, 605.12 and 391.52

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Solution

The fourth proportional to 438.23, 605.12 and 391.52 is: 540.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.23 : 605.12 = 391.52 : x
  2. Step 2: Convert to fraction form
    438.23/605.12 = 391.52/x
  3. Step 3: Cross multiply
    438.23x = 605.12 × 391.52
  4. Step 4: Simplify right side
    438.23x = 236,911.60
  5. Step 5: Solve for x
    x = 236,911.60/438.23
  6. Step 6: Final answer
    x = 540.62

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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.