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Finding the Fourth Proportional to 438.40, 605.27 and 272.86

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Solution

The fourth proportional to 438.40, 605.27 and 272.86 is: 376.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.40 : 605.27 = 272.86 : x
  2. Step 2: Convert to fraction form
    438.40/605.27 = 272.86/x
  3. Step 3: Cross multiply
    438.40x = 605.27 × 272.86
  4. Step 4: Simplify right side
    438.40x = 165,153.14
  5. Step 5: Solve for x
    x = 165,153.14/438.40
  6. Step 6: Final answer
    x = 376.72

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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.