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Finding the Fourth Proportional to 438.58, 605.31 and 272.85

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Solution

The fourth proportional to 438.58, 605.31 and 272.85 is: 376.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.58 : 605.31 = 272.85 : x
  2. Step 2: Convert to fraction form
    438.58/605.31 = 272.85/x
  3. Step 3: Cross multiply
    438.58x = 605.31 × 272.85
  4. Step 4: Simplify right side
    438.58x = 165,159.35
  5. Step 5: Solve for x
    x = 165,159.35/438.58
  6. Step 6: Final answer
    x = 376.57

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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.