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Finding the Fourth Proportional to 438.23, 605.91 and 383.55

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Solution

The fourth proportional to 438.23, 605.91 and 383.55 is: 530.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.23 : 605.91 = 383.55 : x
  2. Step 2: Convert to fraction form
    438.23/605.91 = 383.55/x
  3. Step 3: Cross multiply
    438.23x = 605.91 × 383.55
  4. Step 4: Simplify right side
    438.23x = 232,396.78
  5. Step 5: Solve for x
    x = 232,396.78/438.23
  6. Step 6: Final answer
    x = 530.31

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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.