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Finding the Fourth Proportional to 438.23, 605.05 and 392.06

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Solution

The fourth proportional to 438.23, 605.05 and 392.06 is: 541.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.23 : 605.05 = 392.06 : x
  2. Step 2: Convert to fraction form
    438.23/605.05 = 392.06/x
  3. Step 3: Cross multiply
    438.23x = 605.05 × 392.06
  4. Step 4: Simplify right side
    438.23x = 237,216.44
  5. Step 5: Solve for x
    x = 237,216.44/438.23
  6. Step 6: Final answer
    x = 541.30

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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.