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Finding the Fourth Proportional to 478.89, 660.87 and 271.89

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Solution

The fourth proportional to 478.89, 660.87 and 271.89 is: 375.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.89 : 660.87 = 271.89 : x
  2. Step 2: Convert to fraction form
    478.89/660.87 = 271.89/x
  3. Step 3: Cross multiply
    478.89x = 660.87 × 271.89
  4. Step 4: Simplify right side
    478.89x = 179,683.94
  5. Step 5: Solve for x
    x = 179,683.94/478.89
  6. Step 6: Final answer
    x = 375.21

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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.