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Finding the Fourth Proportional to 478.22, 715.49 and 272.88

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Solution

The fourth proportional to 478.22, 715.49 and 272.88 is: 408.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.22 : 715.49 = 272.88 : x
  2. Step 2: Convert to fraction form
    478.22/715.49 = 272.88/x
  3. Step 3: Cross multiply
    478.22x = 715.49 × 272.88
  4. Step 4: Simplify right side
    478.22x = 195,241.55
  5. Step 5: Solve for x
    x = 195,241.55/478.22
  6. Step 6: Final answer
    x = 408.27

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.