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Finding the Fourth Proportional to 438.25, 605.15 and 383.62

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Solution

The fourth proportional to 438.25, 605.15 and 383.62 is: 529.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.25 : 605.15 = 383.62 : x
  2. Step 2: Convert to fraction form
    438.25/605.15 = 383.62/x
  3. Step 3: Cross multiply
    438.25x = 605.15 × 383.62
  4. Step 4: Simplify right side
    438.25x = 232,147.64
  5. Step 5: Solve for x
    x = 232,147.64/438.25
  6. Step 6: Final answer
    x = 529.72

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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.